TPMS

I have the TST 507 Flow Thru model....you can add air pressure without removing the sensor. Bought mine just before my 2 month trip out west last year. They worked great...let me know asap of low pressure as soon as it happened. They also provide temperature which is something you also want to keep track of. I'd recommend the TST's ....but any brand that performs well is worth the price. The TST's were an easy install as well.