hey guys been a while, been hard at work on the rig she's changed quite a bit (pics soon) and i'm starting to have fun with the wiring now i was wondering if anyone has done a homemade circuit-board speedo controller or if one is sold after market ?

I've never heard of it... You check with the guys over at www.1stgen.org ... Or try with Autometer I'm sure there is something out there...

i'll have to take a look! thanks for pointing me in the right direction, now let's hope someone actually makes such a thing! ---- UPDATE ---- so it appears that half of all first gen owners have speedo problems lmao! i found what i think i'm looking for after digging around on the 1st gen fourm. what it looks like is that you only need need the 5v, the ground, and the signal going to the cluster there shouldn't be any need to use the PCM after a little splice and dice here's the link that explains what goes where and what the wires should be http://www.1stgen.org/viewtopic.php?f=30&t=10184 here's another handy site i found while poking around http://www.transmissioncenter.net/speedometer_calibration_______va.htm#gm ratio adapter