Hello, I have a 65 Fastback with the stock 3 gauge instrument cluster. I recently purchased the GT/1966 5 gauge cluster. Having a little difficulty with the wiring. I found a wiring diagram for a 65 3 gauge and a 66 5 gauge but the fuel gauge wiring if different from 65 to 66. Only the Amp gauge has markings ( RED & YEL). All the other gauges do not have markings to indicate power side or Sending Unit Side. Does it matter? Not sure what to do. Could you fry the gauge if connected backwards. Does anyone have experience putting one of these in. Thanks.
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