Hey guys,

I decided on my winter project. I plan to build a new cluster from my trans-am, based off the Arduinio microcontroller - I use em all the time for computer stuff, why not in my car.
I can turn on/off leds, display data on lcd's all kinds of neat stuff.

I need info on exactly what signals are coming from the speedo/tach sending units.
My gauges now use the digital setup so it shouldn't be that hard, I mean they are normal analog gauges, but there is no speedo cable, it all works off a wiring harness. I have the pinout, I just need to know how to read them.

 

I found that my car uses a 2000 pulse per mile (Vehicle Speed Sensor)
If I understand correctly, 2000 pulse = 1mph or .5 pulse/Second

Can anyone confirm this?