hey guys I have a autometer ultra-lite speedometer 4489-m, Its hooked up to my 2000 t56, it lights up, hand goes half sweep when I start the car bbut it wont work, I done the calibration on it but still nothing, did anyone else have this trouble? I have the yellow wire ran to the signal for the gauge and purple to ground, is that right? any info or links would be great, thanks