+1 for the
TST TPMS / Temperature Monitoring system.
I use the TST (507)
user replaceable battery type sensors - regardless of the sensors you install it really is a huge time saver.
I think you'll discover that with a TPMS (and temperature) monitor that you're checking and futzing w/ the tires (and compressor hose / tire gauge) a LOT less...and checking the tires (by turning on the monitor) a LOT more....as such i don't see the advantage of the
flow-thru sensors....im lucky if i have to add pressure to my tires twice a year...usually once.
regarding the TST user replaceable battery sensor - they require new batteries about every 12-15 months (in my experience) and I've found batteries for 38 cents each via
Amazon TST makes a system (510) that has a 5-7 yr battery life but they are
factory replaceable batteries only & must be returned to TST for service (iirc the fee was 20 bucks per sensor)....for $3.90 a year ill replace the batteries.