gregkring Posted October 16, 2006 Share Posted October 16, 2006 Finished up another car with a GM DIS (wastespark coilpacks) ignition and trying to get the tach to work. Using the MSD adapter and everything works fine above 1500 rpm. At idle the needle is either dead or jumpy. I spliced the tach adapter in at the ignition transistor box in the passenger footwell area. This car is a 260 z. I pulled the tach out and it just has a green wire and a black wire. The black wire has 12 volts when ignition is on. On my 240 I used a Stewart Warner tach , so no problems there. On this customer car we want to keep the stock tach, even if it is old an inaccurate. Any ideas on making it read at idle speeds? Would a 280z tach fix the problem, and what do the connections on it look like? Greg Kring Quote Link to comment Share on other sites More sharing options...
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