Thanks. I swapped the chip right off before the first install. It gives me the correct odometer reading but throws the speedometer off which drove me crazy. I then reinstalled the GXP chip and am currently showing the wrong odometer reading, a low coolant light, but the speedometer is correct. I want the best of everything, no low coolant light, correct odometer, and correct speedometer. If I could get the low coolant figured out I could send the GXP chip in to have the mileage adjusted to the correct 86k miles. Right now I am considering pulling the dials off of both clusters and swapping the guts(circuit board) of the clusters. leftd90 mentioned that this may not work though due to different ratios on the gauges. I know the tach would show a different redline but I am not worried about that. I will have to compare the speedometers to see if the ratio is different or if the GXP just has more travel.
Black 2000 SLE