Factory production rally instrument cluster. Question - Can the amp gauge be wired in to a switched wire off the cluster (neg ground to frame) to work? or Will I need to wire from the alternator to gauge to battery? Seems the new wiring kit, the previous owner purchased, omitted the amp gauge (Or I'm missing something and over thinking this). So while it looked official, it never worked since my purchase. FYI - Factory tach works great, with MSD iginition, after updating electronics and after finding out the wiring was backwards. *heavy sigh* Second electrical something I found installed backwards on this ride. Waiting for the day smoke rolls out from under the dash. <<<J/k'g...I hope. Which leads me to the next question Second question - Can someone tell me which side, on the amp gauge, is positive and negative (just so I know for sure)? Thanks!!!