Tachometer wiring help '77 Jeep CJ7?

dudman5703

New member
Jeep CJ7
Orig. AMC 304 V8
Stock Ignition

I wired it as following -
Red - Ignition Power
Black - Ground
Green - Neg. Coil Terminal

At 8cyl. Option
Idles at zero or at least really close.
Hardly moves while flooring it

At 4cyl. Option, flooring it gets to around 800 RPM's...

Obviously its really low, How can I fix that or is the tachometer busted?
It is aftermarket, the stock tach has different wires.
The instructions were just pictures showing to hook it to the neg. coil which I am use to.
 
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