James Bell Posted December 18, 2012 Share #1 Posted December 18, 2012 After spending five years re-restoring my 71 240 due to flooding of two feet of sea water, it is back on the road. One minor issue I can not rectify is that the tach is pegged over to 8K at idle. This is an occassional issue. I checked the wires to the coil and ballast resistor and they seem to be ok, though i cleaned the contacts and applied dialectic grease with no change. Any ideas?ThanksJim71 240 Z Link to comment Share on other sites More sharing options...
Mikes Z car Posted December 18, 2012 Share #2 Posted December 18, 2012 I am curious with no answers, do you have points or something like a pertronix ignition? Link to comment Share on other sites More sharing options...
beermanpete Posted December 18, 2012 Share #3 Posted December 18, 2012 Mine did the same thing. The problem is the tach itself. Replacing the tach is the simple fix. I was able to fix mine by replacing the 2 transistors on the PC board in the tach. You might be able to have it serviced at a shop. The internals are essentially the same as the Smith meters used in many of the English cars from the 60s. Link to comment Share on other sites More sharing options...
LeonV Posted December 18, 2012 Share #4 Posted December 18, 2012 My 260Z tach had the same issue (although it's a bit different than a 240Z tach). Replacement made it all better. Link to comment Share on other sites More sharing options...
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