Spare, I had an analog gauge with the needle dial that I hooked up to the battery and connected the signal wire, (green I think) to it and when I started the motor it showed my motor rpm, although a bit high, I suspect because it was meant for an auto, it was steady and showed any increase or decrease in rpm corresponding to the throttle operation. The digital tach worked fine one day, and has for the last 10+ years, and then one day, wtf! It was after the boat sat idle for a few weeks, and was noticed right when I started the motor. Do these things just up and go goofy all at once or do they die a slow death. I was thinking about taking it out the dash and just hooking the power to the battery and connecting the signal wire to make sure of the tach or the wires. What are your thoughts..
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