I used the two line locks, for the front I had a rectifier out of an alternator so as not to energize the back brakes. Worked great with two step and delay box at 3000. Later on when trans brakes came out I switched. Also tried the throttle air bottle gizmo, it let the pedal go to floor then delay box on release activated the air plunger to snap the throttle on. I liked that system better because the squirters were not used up.