thepod, I'm adding an Airmar ST69 speed and temp pickup to the transom. I believe they also make a temp only pickup. No "Y" adapter exists for my M84. Airmar sent me to Gemeco (
http://www.gemeco.com/) for help. Gemeco sent me the connector for the M84 along with the ST69 pickup and directions for putting it all together. This does require soldering to the new connector pins but looks to be fairly straight forward. I just pulled the cover off the boat and should get around to actually installing this in the next couple of weeks.