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1966-2013
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13,741 Posts
79 was a mechanical tach wasn't it?

If yes, the drive cable goes to a fixture on the water pump.

If electric, the gauge gets a trigger signal from the coil -ive terminal.
Dunno your specific color, but later models did it with a white wire.
 

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Premium Member
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25,340 Posts
The 79 I'm working on has an electric tach. Two wires, one 12V and one a signal from the minus side of the coil. Alas, both wires are white.
I have the wiring diagram in a PDF from papajam. Tell me your email and I can send it.
Andrew
 

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Trained (ex)Professional, , 1953-2018 RIP
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16,232 Posts
Andrew,
The 1979 Spider R5 version diagram has a 12VDC pink wire to power the tach while the trigger wire from coil negative is white. Did I send you the R5?
 
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