Flaky oil press gauge /circuit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hounddogs! · 09-10-2008, 01:59 PM

Until yesterday, it read 3/4 scale hot on the road and 1/4 scale at idle. Now I'm seeing 1/2-3/4 scale at idle and 3/4 to full scale when driving. RPMs don't matter much. Oil level is good and the needle does drop down with power off.

1. Do I blame the printed circuit or the gauge itself?
2. Can I run a printed circuit for a tach dash w/o the tach (until I get that upgrade done)?

Thanks.

**john** · 09-10-2008, 02:02 PM

The oil pressure guages are mechanical in these trucks. I would check the pressure with another guage. Yes on the printed circuit.

hounddogs! · 09-10-2008, 02:34 PM

So, I just have oil working against a spring and no power into the gauge at all? I was thinking (without cracking open the manuals) that resistance in the gauge or that chunk of the printed circuit had gotten f'd up somewhere.

If it's purely mechanical, I'll pull the gauge and see what sludge falls out.

Thanks.

09-10-2008, 01:59 PM	#1
hounddogs! Restoring it $200 at a time... Join Date: Aug 2008 Location: NE Kansas Posts: 887	Flaky oil press gauge /circuit Until yesterday, it read 3/4 scale hot on the road and 1/4 scale at idle. Now I'm seeing 1/2-3/4 scale at idle and 3/4 to full scale when driving. RPMs don't matter much. Oil level is good and the needle does drop down with power off. 1. Do I blame the printed circuit or the gauge itself? 2. Can I run a printed circuit for a tach dash w/o the tach (until I get that upgrade done)? Thanks. __________________ Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society '68 5.3L-4 speed LWB C20; grandpa bought it for the farm in '71. Now LS 5.3, rather than 327. DD '09 Pilot Weekender '65 Skylark 300-4V-4 speed Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine. Son's '04 F250 SuperCab 6.0

09-10-2008, 02:02 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Flaky oil press gauge /circuit The oil pressure guages are mechanical in these trucks. I would check the pressure with another guage. Yes on the printed circuit. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 09-10-2008 at 02:04 PM.

09-10-2008, 02:34 PM	#3
hounddogs! Restoring it $200 at a time... Join Date: Aug 2008 Location: NE Kansas Posts: 887	Re: Flaky oil press gauge /circuit So, I just have oil working against a spring and no power into the gauge at all? I was thinking (without cracking open the manuals) that resistance in the gauge or that chunk of the printed circuit had gotten f'd up somewhere. If it's purely mechanical, I'll pull the gauge and see what sludge falls out. Thanks. __________________ Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society '68 5.3L-4 speed LWB C20; grandpa bought it for the farm in '71. Now LS 5.3, rather than 327. DD '09 Pilot Weekender '65 Skylark 300-4V-4 speed Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine. Son's '04 F250 SuperCab 6.0

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