Hello again everybody. Would the problem with the light coming on be because i installed 1 brand new tire on the front right side and the rest our the older tires. The tires psi was all about the same 37lbs I pressed the button on the flat tire display and the light went out but did this same thing before and the light came on again. where do i find the reset calibration or is that flat tire button it. Thanks to everyone for your help!!! SIGNMARK [email protected]