with an actual pressure transducer mounted to the main gallery and some ecm reprograming it could be done. . but that isn't ever going to happen through DC... their 2 position pressure switch costs like $10-15... a good quality pressure transducer can be 10x that price. . might need to be rewired to the ecm also... pretty much all OEM type pressure transducers are 3 wire [5vdc, 0vdc, signal (0. 5-4. 5vdc)], and i am 90% sure our pressure switch is 2 wire