I finally got my speedometer working
I have a Holley HP and bought a driveshaft speed sensor that goes on the diff pinion
https://www.motionraceworks.com/prod...action-control
I hooked into the holley as an input, then display it on the Holley 3.5" LCD screen



Expensive , yes, but one of the limited options I have with a powerglide trans


I'll also be logging this at the track to see wheel slip

 

Definitely nice to have the data logging of wheel speed. You could even use the Davis Traction control now if you want.

For dash gauges, did you consider using a Dakota Digital pulse generator with a signal conversion box to drive factory speedo? https://www.dakotadigital.com/index....rod/prd916.htm

 

I looked into it.
But since I was going with a Holley set-up, it seemed like the right way to do it.
I also wanted to keep the interior some-what stock looking.