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Yes you can zero the guage but you need to be really gentle. Basically you
pry the needle off and replace it at the setting you want (zero). I've done it to my VDO gauge and it wasn't too bad.
Something isn't quite right if at idle you're reading 20 inHg. I live in the Mill Creek area (4500ft measured) and have measured 16+ inHg at 900RPM. The only way I can get over 17inHg is if my idle is too high (1100-1200).
What's your idle speed?
Todd
posted by 128.110.4...
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