This is a little off topic, but still automotive and somewhat Crossfire related.

I have a 1982 Corvette project car I am working on. I love the automatic spoiler on my xfire and I am wanting to integrate something similar as I customize the Vette.

I plan to use a wing like this one and have it either simply raise up, or preferably cantilever up like our Crossfire spoilers.



I am hoping to score a Crossfire spoiler assembly from a junkyard car. The mechanical part I think I can conquer, my problem is getting a dry contact or other signal that I can use to control a relay to raise and lower the wing at 60mph and 20mph respectively.

Is anyone aware of a device such as a wheel sensor that I could install to give a signal at a preset or adjustable speed that I could use to trigger my wing actuators?