Both I and iRV2 member "Dr4Film" have the Tire-SafeGuard (T-SG) system. I have flow-throughs on the duallies, cap-type on the fronts and the toad. I'm considering going cap-type for the duallies, in hopes that they work reliably with the valve stem extensions that came on the coach (and/or, may replace the extensions before trading out the flow-throughs). This is more a comment about the valve stem extensions than the T-SG sensors.
As "lucyh" says, the display cycles between coach and toad tires, completing a cycle about every 30 seconds. Problems display immediately.
I do turn on the display unit an hour before "takeoff," as the sensors take time to report in.
You can replace the batteries yourself. I was advised to replace the tiny o-rings at the same time. I replaced the batteries at the two-year mark, before any failed.
I like the fact that I can enter an offset between my manual pressure gauge and what the T-SG system reads, so that I see the pressures closer to what I'd find with the gauge.
I have only dealt with one person (Dion) at the company that sells T-SG. Often he responds quickly; sometimes I have to pester him (Sorry, Dion!). That's the biggest drawback to having the T-SG system, in my opinion.
If you can, you (or the moderator) may want to correct the spelling of the title of this thread, from "Tire SafeGauard" to "Tire SafeGuard" or "Tire-SafeGuard." This would help the search engine, maybe.
If you have other T-SG questions better answered by that method, feel free to send me a private message.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport