Can someone steer me in the right direction. I've done a search.... and so far no luck.
I have a 4l80 in a 73' pick up, and I'd really like to get the speedo to work, without changing the whole cluster?
I heard of some type of electronic adapter that can be added behind the speedometer, and something plugged into the wires on the tranny, and it would work??

Any advise/direction would be much appreciated.

 

I think you need to change the rear housing and maybe the tailshaft for gear driven speedo.
http://www.shiftworks.com/tailhousing.htm#4l80E

 

If you need a square wave signal like 4000ppm or similar you can use the Dakota Digital SGI-5E. It'll convert the VSS sinewave signal to be compatible. Look at the instructions for application #3 http://www.dakotadigital.com/pdf/650528a_SGI-5E.pdf

 

You can spend $300 or so bucks for a Dakota Digital or Cable-x box with questionable reliabilty or $30 at the local PYP for a C-10 electric speedo,your choice...

 

Hey Guys - Thanks for the information.
I went to the links that you shared, and printed what they offered.