so i don't know if this belongs in this section. But I put a tach in my truck a while back, its got a good ground, i know this because its the same spot where my amp was grounded. Well what happens is up till about 1500 rpms, it works fine, then when i engine revs to about 3000, the needle will shoot from 1500 to 3000, then the same problem but from 3500 to 5400, anyone know why this would be happening. My dad told me that alot of people have this problem.
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