1976 chevy 292 external coil hei tach wiring
 

I have a 76 c30 with a 292. It has a external coil and I have a tach I would like to hook up.

There are 3 wires currently connected. One is the main feed wire and two are going to the distributor leaving one left unused.

Two going to distributor.

http://i398.photobucket.com/albums/p...pspomecdud.jpg

Top view of coil showing the main feed wire(right top) and two going to distributor (bottom two) and the one unused terminal(by my finger).

http://i398.photobucket.com/albums/p...psxg5wwcbm.jpg

It makes sense that this one unused terminal is for a tach. But, I want to make 100% sure so I do not fry anything.

Thanks for any help.

Re: 1976 chevy 292 external coil hei tach wiring
 

Yes, that unused terminal on the coil is for the tach.

Re: 1976 chevy 292 external coil hei tach wiring
 

Usually marked "Tach" on the cover... Unless its an aftermarket piece.

Re: 1976 chevy 292 external coil hei tach wiring
 

With the two wires going to the distributor, one is hot (when ignition on), the other is the switched wire that activates the coil. This second wire is where you want to connect the tach to.