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#8
06-10-2026, 04:46 PM
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Is this a liquid-filled underhood gauge? Those are not accurate at all when they get hot. The air bubble expands with heat and presses on the bourdon tube, which then reads lower than actual pressure.
Only trust an underhood gauge when cold.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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