Hi, thanks for the responses. It's a Borge Warner T5 mated to a 5.0 L . I have thought about the neutral safety switch idea , except the pins would cycle at every shift, and even with a delay timer they would cycle when sitting at a stoplight. I thought about having it hooked to the ignition , but if I had the door open to work on the car while the engine was running I might forget and close the door with the pin extended, then damage the car.
The easiest would be to have a two way rocker switch hidden under the dash , and just activate them manually. The problem I have with that is I might forget to engage them , or get lazy and not engage them .

Here's an idea....what about a microswitch attached to the lokar floor mount emergency brake ? That way if the emergency brake was off , the pins would engage. If I was woking on the car with it running , I'd have the emergency brake on anyway. With a standard trans you pretty much use the emergency brake everytime you get out of the car , no ?

A person would have to be careful that a passenger getting in the car had their door closed before you let off the emergency brake with the ignition on.