Thunder Racing Line loc button
The button in the kit must be pressed twice to release, it is ok for burnouts, but it is very awkward on the starting line.
When you hook the Hurst botton up all it does is make the relay buzz. I figure that someone else has run into this.
Or, if you do not want to keep the TR lighted switch, put the switch between the activation wire and ground, and the light between the signal wire and ground.

