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Try adjusting it as descibed while eng is running.
If you have access to an external tach,test tach or the like,hook that up and use that as well.
You can compare the external tach readings with the indash one and see if they are close to each other.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's HERE
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