Hard to remove and a bloody nightmare to reinstall. There's a screw at the very top that (as you say) needs baby hands to access. I used a 1/4 drive, extensions, universal joint, gum to hold the screw, and an inspection mirror. If your thin and flexible you can do it with the seat in if not...might have to remove the driver seat.
It's interesting that your tach worked with the HEI for 9 years. I had to have my 68 modified to work with non-points type distributors.
I would check the fuse and get alligator clips and wires to bypass the power lead and tach lead to see if it's a bad connection/wire issue. Check the ground too. Basically, try eliminating any reason other than the tach itself.
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