Stinger + 1JZ ignitor = slow reading stock tach?

RacerXJ220

Interdimensional
Mar 30, 2005
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0
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Abalama
Curious, but lately when I have wheel spin I will hit fuel cut at 7000 rpms, not the 7600rpms I have set in the stinger. When reviewing the log, it appears the stinger is recording 7600rpm like it should be for the rev limit.

Is anyone else having issues with the Stock Toyota Tach being just too slow?

Under normal acceleration to the rev limit, or during a neutral rev up, I can hit 7600 like it's supposed to.