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Old 02-16-2013, 03:20 PM
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Lightbulb Installing the Water Pressure Gauge?

Here I go again...

Although my recently purchased boat (1991: STRATOS 254, VRO 70 HP) does not have water pressure gauge, I am considering installing one on its counsel (for all the good reason mentioned by some experienced folks)!

Just out of curiosity, how challenging would it be for somebody, like me, who’s never been much around the boats to do this project? I am pretty handy with hand tools, but I have never had done much with 12V wiring; so, the short (but, an embarrassing) question is; how/where would the gauge wires be connected to the motor?

Here are some pics of my motor settings, and if somebody could point me in the right direction (by this, I mean, which side of the motor), that would be of much help and appreciated!

Btw, Motor Model #: J 70TLESB
Serial #: 025B2257
Outboard Marine Corp., USA
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Last edited by cnc2000; 02-16-2013 at 03:24 PM. Reason: typo
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Old 02-16-2013, 03:28 PM
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What wires would you be intending to connect to the motor? Usually there are none.

A fitting typically screws into the block some where to pick up water pressure. A plastic tube then runs from that fitting to the the gauge. The water pump produces water pressure which is converted to air pressure in the tube. The air pressure moves a needle in the gauge to indicate water pressure/air pressure.

Unless you want the gauge to have internal lighting there will be no wires used at all. Now if the gauge does have an internal light and you want to use it, you will simply connect the two wires coming from the gauge to a 12 volt power source and a ground. You can tap into the wiring for other adjacent gauges if you want to.
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Old 02-16-2013, 03:50 PM
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What wires would you be intending to connect to the motor? Usually there are none. ....... .
Thank you, Jetri1, from quick reply!

I think I miss understood the discussion made on a different forum where the wiring was in question rather than other things. Oh, well, there is a lot more for me to learn about boats, gauges, and how to keep my socks from getting wet (i.e. , not to go overboard)!
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Old 02-16-2013, 03:52 PM
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Quote:
Originally Posted by jethro1 View Post
What wires would you be intending to connect to the motor? Usually there are none. ....... .
Thank you, jetro1, from quick reply!

I think I miss understood the discussion made on a different forum where the wiring was in question rather than other things. Oh, well, there is a lot more for me to learn about boats, gauges, and how to keep my socks from getting wet (i.e. , not to go overboard)!
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Old 02-16-2013, 04:19 PM
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It's the only dash gauge (besides the very similar pitot-pickup speed thru water gauge)that requires no wiring , except for the optional lighting as jethro notes. The important thing to remember is, if the air-pressure hose which connects to the tiny hose barb on the back of those gauges fails ( cracks or falls off due to bad hose tie/clamp, freezes, etc. ) the air in the hose will be replaced by the same water the engine is picking up (SW?) and that will spray all over the dash electrical panel.

Outboard water pressure is a great thing to be able to monitor, you just need to check and maintain the hose and mehtod of securing often enough to avoid the damaging potential. If there is any sag in the line where water may have traveled to, in colder climes that will freeze and burst, so think about blowing it out before storage.
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Old 02-16-2013, 04:22 PM
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Good point TTaxi. I forget to mention that in the ideal installation the tube from the motor to the gauge will run up hill the entire way to the gauge.
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Old 02-16-2013, 04:36 PM
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Thank you all for the info about the mechanical gauge, but what i meant to ask is the 'electric' water pressure gauge as I came across this option on a another forum:

"Now if you want an electric gauge you'll need an adapter kit that converts pressure to an electrical signal. It will screw in the same hole but have wires coming out instead of a hose hook up."

Sorry I wasn't quite clear.

Last edited by cnc2000; 02-16-2013 at 04:37 PM. Reason: .
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Old 02-16-2013, 04:46 PM
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Quote:
Originally Posted by cnc2000 View Post
Thank you all for the info about the mechanical gauge, but what i meant to ask is the 'electric' water pressure gauge as I came across this option on a another forum:

"Now if you want an electric gauge you'll need an adapter kit that converts pressure to an electrical signal. It will screw in the same hole but have wires coming out instead of a hose hook up."

Sorry I wasn't quite clear.
Don't complicate things. Go with the standard pitot tube type gauge. The backlighting you can simply tie into the backlighting (blue and black) from an adjacent gauge...
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Old 02-16-2013, 04:49 PM
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I'm not familiar with the electrical type, but the mechanical with the pilot tubing is pretty reliable and perhaps the easiest to install. On your motor, usually at the bottom pan you will find a fitting. On my Evinrudes it's on the bottom left in the rear if you are in the boat facing the motor. Not sure if this is consistent with other models, however.
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Old 02-16-2013, 05:02 PM
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Complication is not what I am looking for.)

I am just trying to clarify and learn something that was mentioned to me as an alternative to maintenance concerns re. mech. gauges.

I DO appreciate any and all suggestions offered to me!
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Old 02-16-2013, 05:08 PM
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Except for really new, computer controlled engines that send WP signals forward to an electronic gauge, almost all WP gauges on almost all engines are the pitot type.

No offense, but forget what you read on that other forum regarding your OMC...
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Old 02-16-2013, 05:19 PM
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No offense taken; but, as we know it, 'free education' does come with some - mixed packaging...

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Old 02-16-2013, 06:12 PM
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Some later model motors have a sensor that can be plugged into a port on the motor that then connects to the engine's harness. The data is then relayed to the dash if certain instruments are installed. Any motor earlier than 2004 or so is not going to have that capability. Yours certainly will not.

This is not to say that you can not obtain an electronic gauge to install in your instrument panel. You can but it will be more expensive (much more), be more difficult and time consuming to install, and not provide any better data. An electronic gauge and sensor might cost more than your motor is worth.
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Old 02-16-2013, 06:47 PM
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jethro1: "An electronic gauge and sensor might cost more than your motor is worth."

I wouldn't be surprised at all, and while I understand the value of having water-pressure-gauge installed even on an old boat like mine, it still does make me wonder whether it is more for a piece of mind rather than anything possibly going wrong (after all these years already in service)?

Though, I am also familiar with the - Murphy's Law!))

Last edited by cnc2000; 02-16-2013 at 06:57 PM.
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Old 02-16-2013, 08:44 PM
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Does your engine have a 'tell-tale", if it does then check it early and check it often I've been motoring 40+ years and didn't even know you could have pressure gage on an outboard until a few years ago. Never lost a water pump ...
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Old 02-16-2013, 09:03 PM
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Go on line (Google) and buy a gauge "kit" for your engine. Its usually two separate part numbers. One is the gauge the other is the fitting and long small rubber hose that attaches to the motor. It was for my 2006 Suzuki. There will be instructions included with the hose/fitting kit regarding installing it. Follow them...

The very first thing... Buy a factory issue manual for your engine. Very valuable.

Rascal
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Old 02-17-2013, 05:38 AM
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Question A good question...

Quote:
Originally Posted by Curmudgeon View Post
Does your engine have a 'tell-tale", if it does then check it early and check it often I've been motoring 40+ years and didn't even know you could have pressure gage on an outboard until a few years ago. Never lost a water pump ...
What is a 'tell-tale' and where should I look to find it?
Thanks!
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Old 02-17-2013, 05:48 AM
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Question What brand gauges...

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Originally Posted by Rascal1 View Post
Go on line (Google) and buy a gauge "kit" for your engine. Its usually two separate part numbers. One is the gauge the other is the fitting and long small rubber hose that attaches to the motor. It was for my 2006 Suzuki. There will be instructions included with the hose/fitting kit regarding installing it. Follow them...

The very first thing... Buy a factory issue manual for your engine. Very valuable.

Rascal
Thank you..., I've been looking over several different brands (WPG, Tachometer, Trim/Tilt Gauges) and other than posted prices, don't know what brands are mostly used by more experienced guys(?!).
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Old 02-17-2013, 06:51 AM
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When my customers want/need new gauges, I always recommend Faria, and I always buy them from boatersland...http://www.boatersland.com/faria.html

Around $42 for a WP gauge, then all you need is a length of hose to run from the motor to the helm...
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Old 02-17-2013, 07:05 AM
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Thank you, seabob4, I will contact them!
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