My Tach Is Off By 800rpm Or So... - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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My Tach Is Off By 800rpm Or So...

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Old 03-29-2004, 10:39 PM
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My tach is off by 800rpm or so when compared to tach reading from Microtech. Is there any way to fix this? Do I have to swap the gauge cluster out or something? If there is no fix, would installing an aftermarket tach solve the problem? Thanks in advance...
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Old 03-29-2004, 10:49 PM
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yeah have a similar problems with my fd....the oem tach reads about 300 rpms lower than the pfc....whats the deal?
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Old 03-29-2004, 11:43 PM
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thats the reason to go to an aftermarket tach, most factory tachs are not accurate and they lag behind the actual RPM. The inaccuracy increases the higher you rev too.
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Old 03-30-2004, 12:22 AM
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Gravity also has an affect on the gauges also. Mine is accurate untill it gets a little past 4000, then it just starts to fall. After 100K miles, things start to wear out and get loose. It just happens.
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