KamakSun Posted September 23, 2017 Report Share Posted September 23, 2017 Happy Saturday fellow nickel and dimers, My tach has three wires going in. The negative from the coil, this was easy A positive A ground Two questions, should I run the positive off of the coil or a constant positive? Where should I run my ground from? Thank you, Kamaksun Quote Link to comment
Lockleaf Posted September 23, 2017 Report Share Posted September 23, 2017 Ground cable can go to any good body ground. Power should be taken from something else that comes on when the key is in the ON position Quote Link to comment
datzenmike Posted September 23, 2017 Report Share Posted September 23, 2017 The coil doesn't have exactly 12 volts on it when running anyway. More like 8 volts. Connect to the ignition switched side of the fuse box. 1 Quote Link to comment
erniestr8mingin Posted September 28, 2017 Report Share Posted September 28, 2017 Is there a specific wire on the interior harness that you can connect the negative coil wire to? Black/Red? Quote Link to comment
datzenmike Posted September 28, 2017 Report Share Posted September 28, 2017 The '75 didn't have a tach option so there are no wires for one. The negative coil wire is the signal to the tach, so just run a jumper from it into the cab through the hood release cable grommet. Quote Link to comment
KamakSun Posted September 28, 2017 Author Report Share Posted September 28, 2017 How bout a 69? I have the factory dash and I don't see a tach but the center panel has been gutted Quote Link to comment
datzenmike Posted September 29, 2017 Report Share Posted September 29, 2017 Most white and orange needle factory tachs were of the inductive type. Only the '73 was wired in parallel with the coil. If after market follow those instructions. 1 Quote Link to comment
rinigado Posted September 29, 2017 Report Share Posted September 29, 2017 ground somewhere there's a ground (a bolt/screw in the firewall, under the dash?). 12v from some accessory, just like the radio does; turns on and off with the key. signal wire just run another chunk of wire through the firewall to the coil. Quote Link to comment
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