Progress
Here’s the remote set up. Ran three wires for the tach. Bent the potentiometer over a bit and drilled a hole in the back housing (with the tach apart). I will seal that hole up before putting the tach back into the dash, just so no dust can get in there.
Hooked it up and started the car. Turning the screw clockwise slows it down. I was just getting ready to go upstairs and get Sherri to take me for a drive so I could dial it in when it started raining. Crap. This will have to wait.
I know my speedo is dead nuts accurate. Already dialed that in a few years ago with gear changes and the correct adapter. There is a radar warning sign on one of the local highways that has a read out of your speed, and I double checked the other day. Still right on. So with my current 27.04 inch rear tires, and the 4.10 gear, I should be turning 3567 rpm at 70 and 2293 at 45. I figure if I have both of those pretty darn close, that is as good as I can expect out of a factory tach.
One question: since the resistor in the black wire is apparently not factory, would I be better off eliminating it and using the potentiometer to dial it in? Any electrical gurus in the house?
One other thing; I had forgotten that one of the tabs on the lens housing is broken off. Probably no big deal, as I still have three of the four screws holding it in. I may post in the classifieds to see if someone has a good to excellent original they would part with. Not interested in a repop.
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