I have no sensors in my 2012 and wheels from 2012 on 2013. Both set to zero with Procal and no light or buzzing. I don't know about the optional 4 wheel sensors system, but for the normal one light system, it worksI dont think the Procal will turn the light off if you have NO sensors present. It has to read the sensors, THEN sets the threshold to -0-. My 2013 (433 mhz sensors) has the tires/rims off my 2012 (313 mhz sensors) on it. Procal is useless for re-setting the TPMS. The Jeep is not detecting ANY sensor, so it shoots the light, regardless of where I have the setpoint.
Drove for 40 years without sensors! By the way, dolphins will win AFL east!My two cents, I wouldn't turn it off. I got aftermarket tires from discount tire and paid the extra like $40 to install the sensors. I have the procal module which I used to set it to 28 psi. That said, it reminds me to re-inflate the tires before I get on the road home. Could save you a major headache. Just saying.