tach wires, non tach 620

[77Datsun620]

My tach showed up today, just wondering if there are tach wires in my dash, i could have sworn i read a post here that said they should be attached to the harness even though my truck didnt come with a tach from the factory. I havent gotten my haynes manual yet( still waiting on slow ass Ebayer), just would like to know what wires go to what hookup on my tach.

[laniadude]

is it a stock tach or aftermarket??

 

I don't know about stock tachs but I have a sunpro tach and it hooked straight to the coil for the reading and power wire (ignition) for lights...I dont know about the harness hookup

[datzenmike]

I can't find any diagrams for the tach option before '76 and only clock before that. If a '76 or newer the clock OR tach share the same plug. It is taped into the wire harness above the left side opening (usually covered with a plastic block off plate) beside the speedometer. It has 5 wires going to it:

 

Blue: tach signal from EI.

Blue/White: +12 at all times (for clock not used)

Black: ground

Black/Green: +12 ignition on only.

Red/Blue: dash lights (on with head lights)

[77Datsun620]

sorry, Its a Auto meter sport comp tach, and its 4 wires to hook up a Signal, 12v ign, ground, and lamp. And thanks again to Datzenmike (who has helped me out a ton) so i guess i hook to the blue, black, black/green, and the red/blue.

[freaky510]

I would run new wires to the coil and for power would trust old wiring.Imo