After thinking about mentioning lubricating any moving parts, the thought that everyone most likely has a much newer and nicer boat than mine, crossed my mind.
So curiosity won and I googled the tach and sure enough the tach works via pulses from a pickup on the engine vs a cable from the distributor. So to learn a little more I called Faria, which I was pleasantly surprised to learn they are based in CT.
I explained that on Winnipesaukee.com I had read about an issue some are having with a bouncing needle on their tachs. The gentlemen I spoke to offered this as a slim chance to correct your issue.
On the back of the tach is a button or switch that allows the tach to be adjustable ( universal )and work with different engines. First make note of this buttons position so you put it back in the same position. Move the button back and forth to try to 'scratch' any corrosion off that may have formed on the contact points. He did say as the tach begins to show signs of failing the needle will occasionally bounce and eventually get stuck in one spot and stop working. This was beyond a corrosion issue.
Start with trying to scratch/ clean the button by moving it and check that connections are tight and corrosion free.
I like tinkering with older cars and as wiring and connector metals oxidize or corrosion occurs is when funny electrical issues pop up.
Hope that helps.
Good luck.
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