Author Topic: Electric vs Mechanical Tachometers  (Read 283 times)


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Electric vs Mechanical Tachometers
« on: May 14, 2019, 11:26:24 AM »
Interested in the pros and cons of mechanical and electric aftermarket tachometers.
For example, Which type is more accurate? Is there a delay/lag in displaying engine speed with one or the other? Possible interference with throttle linkage etc with cable drive type? What choice of tach drive distributors for an SBC (GM Corvette, Accel and Mallory spring to mind)?
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3 bumper, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA. Ex-Racer at Lions Dragstrip in Long Beach.

Kelley W King

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Re: Electric vs Mechanical Tachometers
« Reply #1 on: May 14, 2019, 12:20:02 PM »
While most of my mechanical tach experience is corvette, I believe that they are generally more accurate but do have some needle bounce. Seems like when RPM is dropping quickly the needle will bounce more.
69 Z28 RS Scuncio Hi Performance
69 SS L78
67 SS Chevelle
64 Corvette
66 GTO Tiger Gold
77 Trans Am Special Edition