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Jul 21st, 2025 | | | | Joined: Jan 2016 Posts: 246 Shop Shark | | Shop Shark Joined: Jan 2016 Posts: 246 | My aftermarket oil pressure gauge on occasion will drop from 20lbs to 0 lbs at idle. and today driving along around 35mph it dropped from 35 lbs to 0 lbs and then came back up again to 35 lbs.
Truck runs great, dipstick shows oil is full. Can these oil pressure gauges go bad ? Never had one act this way. It freaked me out the first time it happened. I pulled over immediately and shut engine off and checked the oil. It was full. Started the engine up and had 35 lbs immediately.??????...This is an after market gauge.
1953 chevy 1/2 ton with 3 speed 318 on floor and 1955 235 engine
| | | | | Joined: Apr 2005 Posts: 7,442 Bolter | | Bolter Joined: Apr 2005 Posts: 7,442 | Check all your connections and fittings. If all good then replace the sending unit. If that doesn't fix it then the gauge is next.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
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| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Are you running a direct-reading gauge or an electric one? A direct-read gauge (with a pressure line, not a wire) would be very unlikely to fail intermittently. What can happen is a sticky oil pump relief valve which can allow the pressure to drop suddenly, then recover as the engine is shut down and restarted. I'd suggest running a temporary direct-reading gauge to see if you can duplicate the problem independently of the present gauge. It won't take very many sudden episodes of actual pressure loss to do some pretty severe bearing damage.
Jerry
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