Hello Fellow Bricksters,

Yes this is way too long, but here goes anyway.

As part of my continued effort to reinforce the wifey's contention that I work on this car too much, ordered new gears for the speedo and installed them. Much to my disappointment it did not move, so in we go and double check it all. No Move, so since a pick ur parts run yielded an entire unit from an 87 (Large Tach), removed that speedo, installed the gears in it. No move when installed. Installed the Speedo in the donor gauage package and everything worked, except the Odometer. So there have now been several swaps in and out of clusters, speedos. and gears. So two guage clusters, two Speedos, and (the donor speedo had a good large gear) two large gears have been swapped in and out. Double checked the connections, did find one lead bent on the first speedo and touching the side. With motor in my hand you can rotate the gears with ease and the numbers move. But that has been the only way to make them move. Now about three months ago, put a donor gear from a pickurpart unit and it ran for 1 mile before the teeth of the unit gave up. So the first speedo did move recently. Checked the size and teeth on the new gear and they see to match. Also the fit to the teeth on the motor and mating gear looks really good.

Going down to the electronics store later today and will pick up a couple of caps to replace the old ones (looks like a 220 and 470 micofarad). Replacing the ones in the donor car mini clock did the trick. But is there something else that I may be missing? Maybe the little motor has to the installed a certain way?

I have access to a pulse generator and scope. Does anyone know what voltage the signal from the trans is normally and a range of frequencies? This appears to be a pulse based ciruit, and there is a good signal, the speedo part works on any combo of speedo, cluster, ect... Could use that sort of setup to check for operation before the dash test is done?

All ideas are welcome.

Regards,

PT