[thekidd]

A basic check for the reference sensors is to try and start the car (even if you know it wont) and see if the Tach bounces at all. It may bounce a little when you move the key from the ignition position, but that doesnt count, only when you are trying to start the car. If the tach does bounce when you are trying to start the car, they should be OK. If not, try shaking the speed and reference sensors wire connections. I have the BMW style reference sensors in my car and I have to do that every now and then. Good Luck