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need help on wirin g for new gauges


New member
hello, iam new to this site and i have a 87 convincer iam restoring and need some help on rewiring new auto meter marine guages. i dont know what wires are what. if anyone can help me with a labeled diagram i would be greatful thanks. mike
Hey Mike I have a 87 also what you can do use a ohm meter at the gauge one lead and go to the sender with the other lead with extended piece of wire and if the meter shows 2 to 3 ohms you would know you have the right wire from front to back. The rest on the gauge one for power for running light and one for ground. Auto meter has a install sheet for wiring their gauges. But one thing sender must match the gauge like if fuel sender is 73 ohms for empty and at full 104 ohms the gauge should show full at 104 ohms. You can pull your sender out of fuel tank and take a ohms reading float arm down empty and raise float arm up meter on ohms Poss lead on sender post and the other on sender metal and get your readings and let auto meter no. The temp sender works the same way but reads hot and cold for its resistance numbers Hopes this helps let me know if I can help more.
Boats are more liberally wired than cars, frequently there isn't an easy to use diagram available, you have to go by ABYC colors. For instance pink is usually the fuel sender, black will be ground, tan will be the water temp sender. Best thing to do is label the wires as you pull them from the old gauges.

Here's a linky with the color codes: https://www.cpperformance.com/t-boat_wiring_colors.aspx