Challenger Rallye Gauge Tachometer wiring

[dpflyguy]

 

Hey guys,  I have a 73 challenger with a 440 dropped in her.
so i also upgraded to Ralley gauges and all is working except the tach.
I have a RB Distributor that i picked up from Summit and its electronic with
two wires coming from it. now the question:
does anyone know the connections on the back of the Dodge rally tach?
there is a tall stud and about 4 additional small screws on the back. Just wanted to know those connections. One of them has a tab on it.
any help is mucho appreciated!

Thanks

[MEK-Dangerfield]

That tall stud is for 12 volts supplied from a switched source. Meaning that power source will be turned off when you turn the car off. That stud with a tab on it is for a wire coming from the "-" side of your ignition coil. That is the signal.


  Mike