Electric Stepper Motor Gauge Question
 

After reading the Autometer article, I figured I'd ask a question that has been bouncing around in my head for a while.

We have replaced a lot of stepper motors in GM gauges over the years, and we have a supply of them on the shelf for future use. I have an '86 K10 that I will be swapping an LS into, and other than 90-91 Suburban & Blazer cluster/aftermarket gauges there isn't much of a way to get the speedometer to work while also sending a signal to the computer. I've thought it'd be need if I could disassemble the speedometer and mount a stepper motor, then wire it to the speedometer output but I don't know if I'd have to have a separate module to control it...

Does anyone know if/how a stepper motor could be retrofitted into an older gauge?

Any electronic gurus here?

Does anyone have any contact information of someone who may be able to help me out? Any help would be appreciated.