Join Date: Mar 2018
Location: SF Bay Area, Ca
Tach gets interference from headlights, brakes, and horn
Hello, i have a new Autogage Tach with some pretty distinct issues that im sure one of you fine people could easily help me diagnose (im ok but definitely not good with electronics/wiring)..
Sometimes, it seems on cold startup, tach works fine, but after about 2 minutes, one touch of the brakes, headlights, or horn and the needle will start bouncing around, but only when one of those three is active.
Other times, the needle will be bouncing around from startup, but if I turn on the headlights or hit the brakes, it settles down and acts as it should (opposite issue..!!)
I've researched the interwebs and read about the importance of a great ground for tachs in particular, moved the ground to a clean unshared wire straight to the engine block, tested it, same issues..
Which leaves me with the power and signal wires...
(story continued in first comment)..
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