I was just replying to say this and had 2 windows opened and seen you had posted, Basically you need to do a voltage check from + battery to the oil pressure sender connection while the car is idling to see if it will provide enough voltage to open a relay, 15psi should be adequate, Some of the cars in the TA series run alarms at 20-25psi, Just hook it up how you have it and see how it goes.