abcx09t

Can someone post some details on connecting a diagnostic tachometer to the TPI distributor. I want to do the IAC and TPS check/adjustment for my idle speed which is currently too high. However, I can't figure out how to connect a tachometer to the distributor or coil. Can someone put up a diagram or photos of how this can be connected. I have an older tach for distributors with the coil and points but nothing with the HEI and separate coil. I even have a multimeter that can check this if I know where to put the red and black line pins into the connectors.

Thanks,
Scott

ChevelleFan

iTrader: (4)

Take the wire on the tach for "negative side of the coil" and splice this into the wire on terminal 'R' on your distributor -- on the 4 wire connector, it should be the 3rd one, counting from the left. If you pull the cap off, you should see the module labeled 'GBRE'.

Anyway, terminal R is a tach-reference signal and should give you what you are looking for.

-Dave