tach reading high

[Andrew Piipponen]

I have a smx magentic pickup installed. At idle it reads right around 950-1000. Shot it with a photo tach and it is reading 800 actual rpm. If i bring up speed to say 1500 rpm photo tach says 1400. Any input on this? Might it be a faulty sender or do i have it installed to close or to far from the fly wheel. Motor is a 6bta 300hp.

Topic

[Tony Athens]

Analog Tach Accuracy Questions

Figure out if the tach is “fine tune-able”.. If not, nothing much you can do.. If it is, then put your engine at approx 2500 RPM on the tach, get a strobe and set your tack to accurate at about that RPM..

If not “tune-able” get yourself digital tachs. Ask the forum what works best and will fit where it needs to fit…

Tony

[Tony Athens]

This would not be a sender/mag pick-up issue. This would be a tachometer calibration or accuracy issue.

Let’s “see” your tach.

Tony

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