Well. Some progress!!
.
On the way home from work today. The gauge never came off of zero. So tonight, I cleaned the copper contacts where the tach screws into the instrument cluster back. (There was still a little factory tape residue left over from when toyota taped these off 41 years ago haha)
And the tach reads again!
Unfortunately still slow to respond to engine speed. And will jump in some spots as is climbs. Like its trying to catch up.
But all I had was some chainsaw chain oil. So I decided not to use it. Lol.
But to be honest . The thing spins super smooth. I can actually blow on the face of the gauge and just the surface area of the needle is enough to catch lift from my blowing and make it move. Same with blowing on the components behind. They'll spin.
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