First post,

have some questions. I just purchased a 2005 4.4 with stock 18's. Last night I bought a set of aftermarket type 87's with 20" toyo's I mounted them this morning and the tire pressure monitor warning is iluminated in the dash. Are they are actually supposed to be pressure monitors in the tires? I thought there was something that counted the revolutions of the tire and it one was lower than the other side it would trigger the alarm. I know the front tires Have more air than the rears could this be the problem? or or is the problem that the aftermarket wheels dont have the tire pressure sensors in them? Also what tire pressure should I run all around? Manual says 32psi bought when I put the wheels and tires on and checked the guy has them at 40psi. Thanks!