Guys,
My tach did not work at all last season and this coincides with a Garmin graph installation that I did at the beginning of the season. I cut the existing hole in the dash larger with a jig saw so there's the possibility I killed it with the vibrations from the saw. But, at the same time I connected it to the N2K network to bring in the engine data. The network was installed with the boat so I added a tee and terminator with aa extension cable to the Garmin. I can see all the motor data including the RPM's on my graph but nothing on the analog tach. I think that I disconnected the tach from the network on the water last year but don't know if I pulled the tee off and reinserted the terminator or not. Before I go buying another tach thinking I killed it during the graph installation, I want to be sure that the tach would work with the N2K connection as well.