Well, here's the rest of the story.
When other electrical loads were applied, such as radiator fan, heater fan, headlights, the tach would not fail.
There was no physical molestation of the wiring by the brake pedal mechanism. So an abrasion short was ruled out.
And the brake lights would not come on when the brake pedal was depressed.
However, current to the brake pedal electrical switch was only 3.1 volts! So I went to the fuse box and excoriated the ghost of Lucas with some contact cleaner, pinched the fuse contacts closer together, reinstalled the fuses. Problem fixed.
And this was after removing and cleaning the tach internals to no avail.
Well, at least I have a clean tachometer!
Brian N. 79 Spitfire
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