Is there a way to calibrate my factory oil pressure gauge? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Harrison. · 09-28-2022, 11:30 AM

I decided to go from dummy lights to gauges and bought used gauges at a swap meet. I know the engine makes good oil pressure as I had aftermarket gauges up until now but the factory oil gauge does not read correctly. I put a regulator on my air line and at 60psi it BARELY moves the gauge, unregulated at 90psi it only goes up to about 1/4 of the scale. When the truck is at idle it makes about 25psi and it doesn't even register on the gauge. Is there a way to adjust the gauge?

Thanks

RichardJ · 09-28-2022, 02:43 PM

It has probably been dropped and the gears inside have jumped a couple of teeth. If you can take it apart, you may be able to shift the gear teeth. It's trial and error and you have to be careful to not damage the coiled clock spring that is attached to the needle.

**Grumpy old man** · 09-28-2022, 04:15 PM

A big flipping hammer , I probably have a used one I can send you .

**tdangle** · 09-29-2022, 06:16 PM

Can't really calibrate one, but you can verify it is reading correctly using air pressure. Of Course you'll need another gauge to read the pressure and compare.

09-28-2022, 11:30 AM	#1
Harrison. Registered User Join Date: Oct 2014 Location: Chattanooga TN Posts: 75	Is there a way to calibrate my factory oil pressure gauge? I decided to go from dummy lights to gauges and bought used gauges at a swap meet. I know the engine makes good oil pressure as I had aftermarket gauges up until now but the factory oil gauge does not read correctly. I put a regulator on my air line and at 60psi it BARELY moves the gauge, unregulated at 90psi it only goes up to about 1/4 of the scale. When the truck is at idle it makes about 25psi and it doesn't even register on the gauge. Is there a way to adjust the gauge? Thanks __________________ http://harrisonspeed.com Instagram: harrisonspeed

09-28-2022, 02:43 PM	#2
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,412	Re: Is there a way to calibrate my factory oil pressure gauge? It has probably been dropped and the gears inside have jumped a couple of teeth. If you can take it apart, you may be able to shift the gear teeth. It's trial and error and you have to be careful to not damage the coiled clock spring that is attached to the needle. __________________ '67 GMC 2500, 292, 4spd, AC

09-28-2022, 04:15 PM	#3
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Is there a way to calibrate my factory oil pressure gauge? A big flipping hammer , I probably have a used one I can send you . __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

09-29-2022, 06:16 PM	#4
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,209	Re: Is there a way to calibrate my factory oil pressure gauge? Can't really calibrate one, but you can verify it is reading correctly using air pressure. Of Course you'll need another gauge to read the pressure and compare. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC



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