67 Satellite Tach problem

I have a 1967 Satellite with console mounted tach that won't work. All wiring has been checked for connections etc. but still no go. I have put in a new complete electronic ignition system to replace the old points and condenser system (including distributor). I am wondering if this tach will not work on the electronic ignition. Pretty sure this tach was working.

Need (1) switched 12V to power it (2) black wire to ground (3) sense wire to coil neg primary post (same for points or electronic (black/yellow wire on the pentastar ECU pigtail for electronic). (4) another wire for the front face light. if 1 2 & 3 are OK then the tach is shot. EDIT I am assuming not MSD

Thanks for reply. I have the full Mopar shop manual for this car and wiring diagram shows 4 wires from the tach exactly like mine. Black to ground (tested fine), Orange to light- works, Dark green to positive side of coil - done and tested for contact, Violet goes to a Violet with white tracer line on console wiring - it is the 12V power and is working.

You say the wire should be on the negative side of the coil not the positive?????

This may be a dumb question but how does the tach pick up an ignition pulse on the positive side of the coil. I thought it had to read this from the points. As you say, the points are connected to the negative side so maybe the factory wiring diagram is wrong.

This is a factory correct tach, purchased from a fellow who dismantled the same car and he said it was working. I am restoring this car and adding as a factory option so was wiring it as per the shop manual.

Quote:

---

Dark green to positive side of coil - done and tested for contact,

You say the wire should be on the negative side of the coil not the positive?????

---

Absolutely (on the neg side). Not sure if it being on the positive side would fubar a good tach or render it (temporarily) inop (till you switch it back correct/I wouldn't think so but I ain't sure) but change the wire to the neg post (your only option) & see what you get. If all (3) terminals are being fed/have continuity then the tach is bad. EDIT there are no dumb Q's, the points or ECU make/break continuity of the pri circuit to ground & that is the "signal" that is picked up/counted & converted to RPM in the tach (more pulses=higher RPM)