Testing multifunction gauges

[happychapboater]

I just got a boat with a pair of multifunction gauges for each VP engine and I can’t figure out how to test it. The trim and temp on one doesn’t work and just the trim on the other isn’t working. The type of gauges can be seen in the pictures. I’m also having an issue with the tachometer which has both engines in one gauge where one engine jumps all over the place.

 

[dingbat]

I just got a boat with a pair of multifunction gauges for each VP engine and I can’t figure out how to test it. The trim and temp on one doesn’t work and just the trim on the other isn’t working. The type of gauges can be seen in the pictures. I’m also having an issue with the tachometer which has both engines in one gauge where one engine jumps all over the place. View attachment 409749

Can be tested, but you need a pin-out (schematic) to facilitate testing the individual components