tach jumps under high boost...
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Junior Member
Joined: Aug 2013
Posts: 96
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From: Cincinnati
tach jumps under high boost...
i have an early 95 miata, jumped the diagnostic box to get tach to work.
if im driving normal, lets say highway, 80+ mph, no boost, my tach reads fine.
but lets say if i 3rd or 4th gear pull, 4.5k + rpm and 8-11 psi, my tach will jump all over the place until i get under 4k rpm...
reads fine in TS.
i read about checking grounds, i ran new ground with 0 ga. wire i used for my other car audio build.
if im driving normal, lets say highway, 80+ mph, no boost, my tach reads fine.
but lets say if i 3rd or 4th gear pull, 4.5k + rpm and 8-11 psi, my tach will jump all over the place until i get under 4k rpm...
reads fine in TS.
i read about checking grounds, i ran new ground with 0 ga. wire i used for my other car audio build.
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