That appears to be a good idea...... but...... what if you are balls out down track... and the oil pressure drops right at the end of the run.... and your safety circuit catches it... kills power to the ignition..... but 1/2 second later... you are on the brakes hard.... therefore re-enabling the the ignition..... and the car might continue to run.... Is this possible?
One thing I've learned while putting together all the wierd systems on my car is, first, try to imagine all possible scenarios with the new system. If you can think of a circumstance with a system that could happen, no matter how remote, treat it as though it will happen and ask yourself, do I want this to happen? If the answer is no, change the system.