Hi everyone. Having some issues with a non-working tach. Hoping to get some more ideas as to which direction to go.

Needle moves when key is turned on but does not move after that.

So far I have tried:

Cleaning connections at tach.
Attaching a new tach to see if that was the issue
Changing the rectifier



In addition, the following gauges on my dash DO NOT work: Tilt Trim is pinned in the UP position, tach doesn't work, one fuel gauge kinda works, the other doesn't, speedometer doesn't work, Oil level and water temp DOES work.

Maybe there's an issue between the dash wiring and the fuse box? I don't even know where to start.