How do you calibrate the speedometer in a 90-92 car with the electric speedo? I calculated the drive and driven gears I needed to get it as accurate as possible with my setup, but apparently the gears are for cable driven speedometers and won't work in my situation.

EDIT: I think I'll give this a try if I can figure out how to use it

http://www.hawksmotorsports.com/universal-speedometer-signal-interface/

 

Does your vehicle use a DRAC?

 

I honestly couldn't tell you. It's the stock 92 speedo setup, that's all I really know.