I will definitely chime in when somebody replies with an answer. I have an 1995 GTX and 1997 GTX I’m wanting to replace the gauges on both and I have the same dilemma time to YouTube it I guess. my wires are very similar to your picture there when you flip up the front storage compartment hood, you can see them at the top where the gauges are and then a I guess the connection point runs down to the end of the storage compartment, hood, and where they both meet when hood it’s up you can see the wiring harness connection going into the bottom part of the hull