Question about 1984 Chevrolet S-10

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Chevy 84 s10

My oil pressure gauge goes all over the place and clicks with my turn signal I just put a new sending unit on it but still does it what could this be?

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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.

Posted on Apr 14, 2009

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I have a S10 Chevy my oil pressure gauge going s back and forth 40 & 60 driving stopping somethings below 40


Could be normal.
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You could replace the sending unit or have the actual pressure checked with a mechanical gauge.

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spend the 12 dollars and get a universal mechanical oil pressure gauge, remove the oil sending unit on truck and screw new gauge into and start truck. Does it read pressure? I know people will say just replace oil sending unit but i like to visually check for a true oil pressure than to trust a light, at least you will know what pressure your motor has. if you have pressure then replace the sending unit. Most of the time when the sending unit goes bad your oil pressure gauge in the truck will run at 80 psi all the time. Since you have a light the sending unit just says it isn't getting pressure which turns a light on. So be safe and do as i suggest, if there is no pressure at the mechanical gauge then i hate to say it but you may have a bad oil pump. I honestly just think you have a bad sending unit,if you want just replace it and if lights go off thats good, but you still don't know what the pressure is and if you feel comfortable with this then do so.

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Start by checking out what the sender looks like and its location, if you can't find a GMC or Chevy dealer either Autozone or Advance website has a page showing you where the part is located and what it looks like. Your problem is either the gauge, sending unit, or wiring harness. Sending unit is easier to rule out first. Pull the connector off the sending unit, spray some WD40 on the male and female connector parts and scrub gently with an old toothbrush and reassemble. If that did not help buy a new sending unit and replace it. Usually a deep socket is needed for this. If that does not work you are going to have to pull the instrument cluster and replace the gauge.

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80 is on the high side for those... possibly a sending unit issue

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I believe your sending unit is located on the top of the block, towards the fire wall. You can get an inexpensive pressure test gauge and put in place of your sending unit. It should be a 1/4" NPT fitting. Does the pressure gauge fluctuate between low and high RPM? If so, chances are that your oil pump may need to be replaced.

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