Oil pressure gauge reads "off the chart" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KMACD71 · 07-03-2011, 06:51 PM

I've decided to try to fix one of my nagging electrical issues. My oil gauge is one of them and for a while now it reads well past full when idling and the needle practically disappears when I hit the gas. I believe the problem started when changing my wiper motor or something under the dash. Is there a ground wire or something I may have knocked loose? The truck is a 71 with a 350 and has always run fine. Anyone experienced this before and know of a remedy. Thanks.

**too much stuff** · 07-03-2011, 07:20 PM

If it is the stock gauge, that is mechanical. You could try a stock 80# gauge if you can find one.

**special-K** · 07-04-2011, 06:43 AM

That's right. The only thing electrical is the light in an oil pressure gauge. There's a fitting on the back of the block near the distributor with a small tube that runs into the gauge.

**StingRay** · 07-04-2011, 11:28 AM

If you have a hi performance oil pump it'll pin the needle. An 80 PSI gauge from the C40-C60 trucks is just the ticket.

07-03-2011, 06:51 PM	#1
KMACD71 Registered User Join Date: Aug 2008 Location: Lethbridge,Alberta Posts: 532	Oil pressure gauge reads "off the chart" I've decided to try to fix one of my nagging electrical issues. My oil gauge is one of them and for a while now it reads well past full when idling and the needle practically disappears when I hit the gas. I believe the problem started when changing my wiper motor or something under the dash. Is there a ground wire or something I may have knocked loose? The truck is a 71 with a 350 and has always run fine. Anyone experienced this before and know of a remedy. Thanks.

07-03-2011, 07:20 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,769	Re: Oil pressure gauge reads "off the chart" If it is the stock gauge, that is mechanical. You could try a stock 80# gauge if you can find one. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

07-04-2011, 06:43 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Oil pressure gauge reads "off the chart" That's right. The only thing electrical is the light in an oil pressure gauge. There's a fitting on the back of the block near the distributor with a small tube that runs into the gauge. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

07-04-2011, 11:28 AM	#4
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Oil pressure gauge reads "off the chart" If you have a hi performance oil pump it'll pin the needle. An 80 PSI gauge from the C40-C60 trucks is just the ticket. __________________ Saskatoon, Saskatchewan Canada



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