As I have learned, there is more than 1 type of TPMS out there. Do some homework.
The two systems I am aware of are:
1) Actual sensors on the rim which can detect a change in pressure and alert you. This is the more expensive way to do it. Plus, if you mount aftermarket wheels that don't have sensors, you loose the functionality.
2) Using ABS as the sensor. They use ABS to tell if one wheel is locking up before others and use that info to denote that a tire must be going flat.
Of note, with a type 2 system, if all the tires loose equal amounts of pressure, no signal is given. This is especially annoying on a vehicle with super stiff runflat tires that never "look" low on air. On several occasions, while figuring out the problem, I would have 3 tires with 32psi and 1 tire at 20-25psi and no dash warning.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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