Ok, so here's the update.
Tach: cleaned all the connections, and checked the grey wire leading to the tach, which is sending a strong signal. However, still no measurement recording on the tach. Their is an "hours" reading in an LED display and that is just fine. But the tach needle just doesn't move. I tried to jump the ground to the hot to see if the needle would move (similar test on the water temp gauge), but nothing. I'm guessing a new tach.
Water temp: jumped the hot to the ground and the needle pinned the other way. So, we cleaned up the connections on the engine and at the guage and I get readings. Sometimes it bounces like mad, but seems to be giving an accruate temp now. Thanks seapuppy!
Fuse block: ok, so I've got all the documentation now, but none seem to show an accurate/simple diagram of hte fuse black and what each fuse actually does. Oh, well, so long as they are not blown, we'll live with that.
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