I need help! Please! I have a mk3 gti with the 1.8t swapped I paid a guy to do the wiring for me put I have no clue what he did. The car turns on and runs but none of my gauges work (rmp, speedometer, coolant temp, etc.) I noticed he cut all the wires and hooked a few just to get the car to turn on and off . What do I need to have a it done right ?