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Old 11-17-2015, 03:19 PM
  #7  
RogerMurdock
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Originally Posted by jpeff31787 View Post
I should have clarified, I do apologize. It is the round command link gauges. Dealer said we need something to connect the speedometer gauge to the unit that way it pulls in GPS speed in order to calculate fuel burn, mpgs, and etcs. Does that make sense? What do I need for that?
Makes perfect sense.
What you want to do is connect the NMEA 0183 output of the Garmin to your speedo

coming out of the back of the speedo is a white wire and a blue wire
these are the connectors for NMEA 0183 input
blue= ground, white= (+)

in the main cable of the Garmin is a (tiny) blue wire
this is the "NMEA 0183 Port 1 Tx" (+) conductor
it needs to be connected to the white wire behind the speedo
the blue wire behind the speedo gets connected to ground (same ground as the Garmin)

here is a prior thread with the same topic
http://www.thehulltruth.com/boating-...k-gauge.html#b