How do you wire a factory tach?

[flyin99]

I bought a dash cluster with tach. and a wiring harness, but I am lost here.......back of tach. has 2 male terminals pointing down and a threaded terminal in between the 2.the harness has a female plug, but it is shaped sort of like a V or something and a single red wire with some kind of piggy back on it....the other end has a wire coming from the V shaped plug going to a grommet, like it goes through the firewall somewhere.............any ideas? Thanks

[Gee_Emm]

one wire goes to the fuseblock unfused terminal, the long wire goes to neg side of coil.

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1969 Chevrolet Custom Camper 20 350/400 70k original miles, 99% rust free

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Gee_Emm's Page

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[billogna]

I don't have a harness for mine, but the driver's side terminal goes to an on-with-key source, and passenger's side terminal goes to neg. side of coil as you are looking at dash.

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'69 Custom 10 SB
'66 Mustang Sprint
'77 Sportster