1984 S10 oil gauage on dash

Question edited for clarity.
Question moved to model category.

Help in the link. Also click on the images tab

https://www.google.com/search?q=1984+cadillac+eldorado.oil+pressure+switch+wiring+diagram

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Bad ground wires. Inside they will be at the steering column under the dash. And on on each side behind the side kick panels. Also check the battery to body ground and engine to body ground.

I have an 1984 S10 Blazer,bought it new.

Replace the leaking valve on the bracket below the master,your taking about.

if your pressure is too low this fix is quite expensive and not worth for older cars, so the first thing you should try to keep it running is to use THICKER OIL (W20-50 or such), + oil stabilizier (any good oil additive). I tried it in my Jeep,- helped right away.. Good luck

You need to find the ground wire that goes to your dash instrument panel. There is a ground wire that is lose or broken Make sure that all the ground wires are clean and tight.You could try to run a ground wire from your panel to a good ground place. ( This always don't work) but I have done it like this before and worked great. It is only a quick fix, It should be done right. But make sure that you have a really good ground on both the metal panel and metal on your firewall.

check your ground cables on the battery to the frame

Check the ground circuit of the gauges sonds like a loose ground wire somewhere

A Bad ground

Ebay....... I have found out most of the time you can get stuff on there cheaper then what you will find at a junk yard.

replace the sending unit, this is what the do when they fail.