I have a V300/UDX dash and the NOS readings are erratic. The NOS reading on the display was fluctuating between 1.5 to 2.9 with the car powered up and the motor not running. I purchased and installed part no. 220-VP-PT-N1 because the tech at Racepak said I have voltage being exposed and that's what the display is showing. I raced the car last weekend and several times the NOS was fluctuating so badly I gave up trying to get the bottle pressure down. Anybody have any ideas?