- Apr 3, 2011
- Reaction score
- United States
- My Car
1973 Q code Mach 1 blue glow C6 auto
1973 Q code Mach 1 blue glow, 4 speed
1973 H code Convertible ivy glow, FMX
I recently had Rocketman convert my original style tachometer in my 73 Mach 1. I have a Pertronix ignition. Rocketman's wiring diagram indicates that the switched +12V supply can be tapped off of the OEM tach wiring coming off of the + side of the coil. Isn't that where the resistor wire resides for the OEM style tachs? The last time I measured voltage there it was around 10.9 volts. Can I still use this wire for power to the new converted tach or should I run a separate non-resistor wire for switched +12 supply? I'm interested to know how others have wired these converted tachometers.