Vacuum gauge help
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Just like a bathroom scale, if it doesn't start at zero, its toast.
(french, cinnamon, buttered, garlic, rasin, sourdough, cheese or burnt)
(french, cinnamon, buttered, garlic, rasin, sourdough, cheese or burnt)
Last edited by HeadsU.P.; Nov 1, 2017 at 07:48 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Can you remove the needle and reset it to Zero? Yes.
If you do, will the scaling be right? Probably not.
The gauge was likely over-pressured and components were damaged/distorted such that readings will not be accurate....even if the gauge appears to function properly.
But, before you throw it away, you could test its accuracy if you could borrow a similar gauge from a friend and hook both in parallel and connect to manifold port on running engine.
If you do, will the scaling be right? Probably not.
The gauge was likely over-pressured and components were damaged/distorted such that readings will not be accurate....even if the gauge appears to function properly.
But, before you throw it away, you could test its accuracy if you could borrow a similar gauge from a friend and hook both in parallel and connect to manifold port on running engine.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Unless the guts of that gauge are made of plastic (which I doubt), heat would not cause the gauge to recalibrate itself. Perhaps it got dropped, used as a pressure gauge by mistake, whatever. But, you could still test it against another gauge, as I already suggested.
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St. Jude Donor '07
It looks like there is a post there under the cover. remove the cover and see if that will allow you to er-zero it. The cover may screw off, but looks like it will pop off on that one.
