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Check Iforged for their solution to mount the tire pressure sensors utilizing different valve stems.
Tire pressure monitoring system. gizmos in the wheels that relay the pressure to the RFA on the car.
I purchased the Iforged 90 degree stems for my HRE wheels. They don't fit properly. After looking at the picture with me the rep recognized the hole was in a different place on the 547's than he expected. So still looking..
Check out the June 2009 issue of Vette. There is an article in the magazine about Tire Pressure Monitors called Low Pressure Situation. One of the captions shows the TPMS mounted to the inside of the wheel using a band. It notes that aftermarket companies like Forgeline offer kits for this setup. Good luck with it.
The Tire Pressure Monitor is attached to a bracket on the band. The band itself is just like a big radiator clamp, you screw it tight just like a hose clamp. I have i-Forged wheels and there was no way that the TPMS was going to work with anything they offer!