Re: Tach troubleshooting!!
It reads like the elctrical system, the supply side, is being spiked by the brake lights, a lag in power from the instanteous load the brake lights induce upon the electrical system before the electrical system can correct for the load.
I would make sure the ground is good, Secondly, I would power the tach from the ACC or IGN spade at the fusebox, Thirdly, I would swap out the voltage regulator with an electronic design, Wells P/N VR715, plug & play, if you are still running an external regulated charging system.
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