69 S code factory tach. Interior came in boxes. Tach plug from harness that plugs into tach is not cut, wires from back of tach OK. PO ran wire from plus side of coil to ignition switch. Tach doesn't work. Seems like something isn't hooked up. Once when batt was low tach arm swept across all the way and back so its getting power just not from coil. Any help would be appreciated.
You need to get a hold of a wiring diagram. The factory tach has that power wire running through it before it goes to the coil. It's not like an add on tach where you just attach a separate lead to the coil.
Looked at the Tach Man's site and found a diagram that shows the tach wired into the engine gauge feed harness. I thought this was for a 67-68 and not a 69. Also is the famous "pink resistor" wire found in the egine gauge feed harness tha exits the fire wall?