I'm installing a Pertronix distributor which uses 12v at the coil. My Unilite used reduced voltage (in line resistor) and the tach worked fine. Do I need a tach adaptor or?
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Bump.
I run the Pertronix distributor with Ignitor III guts and tacho is hooked up as OE and works.
I put a Pertronix ignition module into a 1971 Pantera recently. It had breaker points prior to the conversion. The conversion required a power source for the ignition module that routed around the ballast resistor. The tach worked normally after the conversion and the car ran better.
I think the tach adapter is needed when you go the MSD route. And the tach adapter is a bit of weak link. It can be damaged when charging your battery. If your battery is in doubt it may be better to replace it than to charge the heck out of it and damage the tach adapter in the process.
I think the tach adapter is needed when you go the MSD route. And the tach adapter is a bit of weak link. It can be damaged when charging your battery. If your battery is in doubt it may be better to replace it than to charge the heck out of it and damage the tach adapter in the process.
Steve and goodroc,
For clarification you used no resistors at all. Is this correct?
For clarification you used no resistors at all. Is this correct?
Yes, and no. The Pertronix ignition module requires genuine 12 volts. I am assuming the Pertronix distributor requires the same as their module. I left the ballast resistor in place and used it to trigger the tach. I think I have read on other threads that this may be unnecessary but I left it that way since it worked. And if someone wanted to go back to 100% stock it would easier for them.
