Posts: 1936
Location: Eau Claire, WI | Doug,
I have had this happen on several boats. On the back of the tach there several places where the wires attach. Make sure the little nuts that hold them on are tight. The other place a wire ataches is off of your voltage regulator (that's where the tach gets it signal from), in most cases this is a push-together connection that has the insullating rubber around it (usually not a lot to go wrong with this one) another possibility could be a voltage regulator that is starting to act up but this would be the last thing I would check as in both cases I had my tested and they were fine.
In my situation I had a loose ground connection on the tach under the dash. In the other situation it was a bad tach. Both of my situations were on Ranger boats that were rigged with Merc motors and Quicksilver (merc) gauges. Not sure who makes their gauges for them suspect Tempest but I know there are various quality levels when it comes to gauges. I had Faria gauges in one of my old Tuffy boats and they seemed to be very reliable as I know the guy who has the boat now and never a lick of issues with the gauges.
Hope this helps you some.
Edited by Mark H. 4/17/2009 7:36 AM
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