I have a 1998 Fishhunter with a 200 Mercury EFI. When I purchased the boat, the water pressure gauge did not work and the tachometer worked intermittently and also gave incorrecft reading when it did work. I was not able to find replacement matching gauges so I replaced the entire set of new Teleflex gauges. While the water pressure gauge now works properly, the tachometer is still giving me fits. I seems to work when it wants to until the motor warms up.

I am sure that all of the leads on the tachometer are attached securely and it does seems to read properly (at times) so I am sure that it is set on the proper pole. However, I do not know where these wires attach on the motor or if there is any other areas that would possibly cause this problem.

Any suggestions where to begin troubleshooting would be appreciated before I head the boat to the dealer for repairs.

Thanks