Took it to our local Goodyear I was told it has a memory because it is USED . The Manager said $25.00 if it works it works if not I waste $25.00 . My Friend who is the Manager at Wal-Mart said his Machine won't work on a GM Gauge . He would do the sensor for Free ...So I'm caught between a Hard place and a Rock : ( If I take it to a GM Dealership I can't Imagine the COST ???