Well of course you need the rallye gauges with the switch panel, becuase the switch panels themselves are different. You will also need the rallye gauge heater control panel, because that too is different. The above gauge light panels are different, there are four lights instead of 3 on the rallye gauges, this you can choose whether or not you want to change it. As far as the wiring harness goes you can use the standard rallye gauge harness, but you will have to add a wire for the tach, lengthen a couple of other wires and change the wire for the oil pressure from going to an idiot light to plugging into a gauge. I think that is all I did when I converted mine. As a precaution check the amp gauge, they are prone to going bad and then frying the harness. Good luck and I hope this helps.
