if you take the climate control unit out of the dash, on the wiring harness there should be a 1 pin male and female connector that arent connected. when I was messing with mine, i found plugging them in changed from metric to american (with the key on)
I don't have time now to check this, but thanks a lot for the info........Hopefully this will work.
98 GTP Coupe- 180* T-stat, GMPP Front Sway Bar, Dual Aeroforce Interceptor's, TDC FWI, TDC Taylor 10.4's, ZZP SS Plog, ZZP 3" SS catted DP, ZZP MPS W/3.4, AL104's gapped @.055, 3800Perf. PCM