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I just got the tachs hooked up to the wiring harness that come from the engine and working fine. The 2 guages I have left are the multi-functional speedometer and fuel mtg guage. I have two wiring harness' that go with these guages that are the same except one has a red wire in it. Can I just connect the wires to the same color wires on either of the tachs or do they have to be connected to both tachs? Speedometer has red, yellow, white, blue x2, and black x2. Fuel mtg has blk,yellow, red, blue, green and green/white stripe. Thanks