72 Tach not working at all

[slmorissette]

I just reinstalled a new cluster and the Tach is not working. Can anybody fill me in on the wiring to the coil which engages the tach? It wasnt working before and thought it was due to installing non standard tachometer. Reusing Bosch blue coil, and would like to set the tach back up properly.

Tried patching a wiring from the green tach wire to the - coil terminal and got nothing.

Any help would be awesome!

Thanks guys

Shawn

[c.d.iesel]

just a long distance hunch ?

look for any wires in the area of the coil not connected to anything

[jerry]

correct me if i'm wrong, but i *thought* the tach ran off the black wire(s) on the distributor....

[Guest Anonymous]

in the older cars that's where the black tach wire connects - the spade connector on the distributor

[slmorissette]

what if you no longer use points? I have a crane set up (pointless ignition) I've tried the neg side of the coil, and all three wires with the crane set up and no luck?

Any suggestions?

What is the method when using pertronix? Maybe I can relate and be creative to get it to work....

Thansk for the help...

Shawn

[adawil2002]

I'm running Pertronix and the tach works fine.

Did the tach work before replacing the cluster?

If so:

There should be a black wire behind the cluster on the tach side that plugs into the male connector on the back of the tach. The same wire runs the clock on non tii cars which did not upgrade to a tachometer.

[Chris_B]

As has been asked, did the tach work before you reinstalled the cluster? If not, Crane may not provide an 02 tach compatible output. Sorry, I haven't done the research on the Crane system, but it is not unusual for an aftermarket ignition system to require a specific tach adapter for the factory tach to work.

[slmorissette]

Yes the tach worked just fine before the conversion, several forums stated the crane requires a tach adapter, found it and purchased it. Hope it works out. Keep all posted incase anybody else hits the same problem.