What is special about the stock fuel sending unit wiring harness used on my 1978 El Camino? I put new Equus Gauges in including the Gas Gauge. I got a new Sending Unit from Summit and I am ready to install it and wondered about the "special" wire used to send the info to the gauge. I checked the gauge and the sending unit while the unit was laying on my seat and it worked great. Can I use just a plane 18 to 20 gage wire to send the info to the fuel gauge instead of the factory harness? If not please tell me what the factory harness actually does. Thanks