I have two Yamaha Digital Multifunction gauges, Tach and Speed on a used boat I've been working on. The gauges look like from the 1990's, and they worked fine when I water tested them. Then I started to work on the changing the center console gauges positions and so I disconnected both gauges. I also disconnected all the cables, hoses, and connectors at the engine to run them all through a rigging tube. After I connected everything, the tach does not display any numbers, it only backlights. The Speed gauge has everything working. I connected everything as it was before (and it is according to the wiring diagram I pulled online), but now the tach shows nothing but backlight. Can someone advise me what to do next? I have a good multimeter.
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