Originally Posted By JAKE68
On a 3 prong switch the middle terminal is the ground for the starter relay. The outer 2 are for reverse lights. So bring power to 1 terminal and the other goes to your trans brake wire. So when you put it into reverse it activates the trans brake.!!!! You can not do it if is a clean neutral valve body.
this is how i did mine and never had a prob in the 2 years i had the TB,mabey only 100 passes but used reverse alot.