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tach jumps under high boost...

Old 11-20-2013, 03:09 AM
  #1  
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Default 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.
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Old 11-20-2013, 10:07 PM
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should i make a ground leading straight to the -ign
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