both dont work so what could be the problem?

 

Sounds like an electrical short or loose wiring somewhere. Most tachs are controlled by the leading ignitors. Try checking the wiring. Trace the tach back to the ignitor.

 

The speedo, on the other hand, is likely to be an issue of a bad cable or a bad [I forget the name of the part] in the transmission. (Or just a bad speedo =)

Check when the cable connects into the back of the cluster and where it connects into the transmission... If it's connected in both places disconnect it in both and try spinning it.

 

Weird both would be out at the same time...Do the rest of your cluster gauges work?

 

yea the temp and the gas gauge work and all the other lil ones

 

im pretty sure the tach runs off the trailing igniter

 

it does, its the negative lead of the trailing ignitor

 

Yeah sorry I meant trailing not leading. It was 3 in the morning and I shouldn't have been posting.

 

its awl good