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1978 s30 Tach wiring help

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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.

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