Tried the motor cycle thingy, couldn't get a clean spot to attach it.
I ended up with the pressure activated, inline switch. Closes when there is pressure in the brake line.
This will work on just about any car. If you want to do this, make sure you get the line Tee to connect the switch to the line.
They can be purchased from Pegasus Racing.
WWW.pegasusracing.com
Hope this helps.