Two years ago, I purchased ORO Technology W410 TPMS off Amazon. It has worked great, a quick glance and I can see tire pressure. The sensors are inside the tire not external which I wanted. It is very accurate and programmable. I even used it to verify my other tire pressure gauges and throw defective ones away. If 3 gauges agree and 4th doesn't, 4th is trashed. Prior to that, I had one in each vehicle and trusted each. Very satisfied after 25000 miles of use and highly recommend it. Note: the sensors are tire specific so when you rotate your tires, the location isn't correct which for me is no big deal.
