$140 USD Shipped
USED
Aeroforce Interceptor PT401 Single Red OBD2 gauge with plug, white alternative face, and metal bracket (?) and two nuts. Can't find that extra 3-wire plug that's for the older cars that came with it.
Comes mounted in a home made 04-08 ball vent mount (for the section just to the left of the steering wheel). Puts the gauge in a really nice spot. The ducting that goes behind these two vent balls is separate so it's very easy just to block off the duct behind the upper one where the gauge is and have the lower one remain functional.
Check here to make sure it fits your year/model first:
Aeroforce Intercepter Scan Gauge ATS – ZZPerformance
'97-'07 Grand Prix
07/08 GP GXP are not compatible.