I've got a GTRLink G4+ and a Perfect Tuning Universal Gauge for the G4+ (https://perfecttuning.net/en/gauge/68-universal-gauge-linkg4.html#/19-faceplate-black_anidozed/25-transparent_cover-no) I'm unsure where to wire the CAN High (white wire) and CAN Low (green wire), or if I'm supposed to use the RS232 TX/RX (transmit and receive???) wires. I see two slots in the ECU (CAN and CAN2 in attached picture) but they don't resemble anything in any of the instructions that I read.  1) Do I n