TakemuraShuu Posted April 22, 2019 Share Posted April 22, 2019 Hi everyone, I have a 1978 280z that I've been working on for over a year now. In this time, I've got everything working from the drivetrain to the gauges (all except the tachometer), I usually drive it everyday. The tachometer is the only thing that doesn't work, and hasn't ever since I've had the car. I removed the tachometer from the dash and tested voltage, it is a 3 wire tach. With key in ON position, Red/black wire going to peg has 10.95v, green has 10.96v, and the black is a GROUND I'm assuming. I bought an aftermarket unit assuming the tachometer itself was bad. Installed it according to the wiring diagram. When I turn key to ON position nothing happens, when I start the car the aftermarket tach flashes once for a split second, but doesn't come on, the needle does not move either. Is there an in-depth diagram on the wiring of a 78 z, I'm mostly finding write ups on 240z's. Any help would be greatly appreciated, thank you so much. Quote Link to comment Share on other sites More sharing options...
jhm Posted April 22, 2019 Share Posted April 22, 2019 Yes, you can download the FSM for free here: http://www.xenonzcar.com/ Quote Link to comment Share on other sites More sharing options...
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