Question about 2004 Chevrolet Silverado

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My spedometer,oil pressure, tachometer gauges sometimes work and sometimes don't. Also my air started messing up today after i changed my battery. It only blows out the defrost now.

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Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair

Posted on Oct 07, 2010

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The gauge problem sounds like your gauge drive motors are going bad, very common on these trucks.

Check my site here about it www.DrSpeedometer.com

Posted on Sep 13, 2010

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1 Answer

Oil pressure


If the manual T gauge is giving a higher oil pressure reading than the gauge on your dash - believe the manual gauge.

The oil pressure gauge on your dash receives a signal from an oil pressure sensor. It may well be that the oil pressure sensor is faulty

Mar 25, 2016 | Cars & Trucks

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Wanting to know why my 2014 nissan maxima is not starting after receiving oil change today?


check the oil level in the sump to ensure that oil was added after draining it for the change
There is a oil pressure sensor / oil level gauge ( different to the oil pressure gauge sender unit) that will not allow the engine to start if there is no oil pressure sensed or no oil level sensed
check for wiring connections as well

Feb 09, 2016 | 2014 Nissan Maxima

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None of my instrument panel gauge are working on my 2007 Cadillac CTS.ALL HAPPEN AFTER REPLACING BATTERY.NO SPEEDOMETER NO TACHOMETER, NO FUEL GAUGE.NO OIL PRESSURE GAUGE.ALSO SUNROOF STOP WORKING.


check to see if you have missed putting a wire back onto the battery, also check to see if any loose wires around battery area, that may have broken from the terminal

Oct 26, 2013 | Cars & Trucks

1 Answer

Instrument panel guages work one day the not the next, whats the problem?


It's tach, not tack, short for tachometer. Were these gauges installed by unionized people? It could have been the gauges' day off, as per their collective agreement.
Most instrument panel woes are caused by bad grounds. Most panels are below the front glass, and if this leaks, guess where the water goes? Dashboard problems are a bear to fix sometimes, and costly in terms of labor. Have someone steal the car.

Jun 21, 2012 | 2005 Chevrolet Monte Carlo

1 Answer

Oil gauge on 91 Dodge Dakota suddenly running very high but plenty of oil


have a mechanic test the oil pressure with a mechanical gauge
it is more than likely that the electric sender unit has failed and is sticking internally
the tic noise could be a relay working from an intermittent power supply or bad ground

Mar 27, 2017 | 1991 Dodge Dakota

1 Answer

The oil pressure gage started registering 1/4 instead of it's normal 1/2 even at 1700 rpm. I FREAKED! Thoughts?


I have an oil pressure gauge that reads in analog, 0 to 150? something like that, any way, it moves like a tachometer, idle down around 10, revs up to 55, 60 when taking off and then settles down at 35 while cruising, I notice a change with heavier oil. Also, I know it will read 55 lbs pressure with 1 qt of oil in there, I tried it. So the pressure gauge has nothing to do with amount of oil in engine. As long as it is full, It should be ok, as long as it is reading pressure, but if the pressure drops off, shut it down and find out what happened, If it loses all the oil, the temp light should come on long before the oil light.

Dec 14, 2010 | 1997 Chevrolet K1500

1 Answer

How do I check and possibly replace the engine oil pressure sensor in a 2006 GMC Envoy Denali?


Oil Pressure Test Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge. A tachometer may also be needed, as some specifications may require running the engine at a specific RPM.
  1. While the engine is cold, locate and remove the oil pressure sending unit.
  2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
  3. Start the engine and allow it to idle.
  4. Note and record the oil pressure reading when the engine is cold. The engine may need to run at a specified RPM, if so check the vehicle's specification.
  5. Run the engine until normal operating temperature is reached.
  6. Check the oil pressure reading again with the engine hot and record the value. Turn off the engine.
Compare the hot oil pressure reading to the specification. If the reading is low, check the cold pressure reading against the specification. If the cold pressure is well above the specification, and the hot reading was lower than the specification, the engine may have the wrong viscosity oil. Change the oil, making sure to use the proper grade and quantity, and then repeat the test.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.

Oct 09, 2010 | 2006 GMC Envoy Denali

1 Answer

Where is the oil pressure sensor located on a 1996 murcury cougar


Look for the oil pressure sending unit on the block or the cylinder head on the V-6 or V-8 models. --- OIL PRESSURE TEST Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge (as opposed to relying on a factory installed dash-mounted gauge). A tachometer may also be needed, as some specifications may require running the engine at a specific rpm.
  1. With the engine cold, locate and remove the oil pressure sending unit.
  2. Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
  3. Start the engine and allow it to idle.
  4. Check the oil pressure reading when cold and record the number. You may need to run the engine at a specified rpm, so check the specifications.
  5. Run the engine until normal operating temperature is reached (upper radiator hose will feel warm).
  6. Check the oil pressure reading again with the engine hot and record the number. Turn the engine OFF.
  7. Compare your hot oil pressure reading to specification. If the reading is low, check the cold pressure reading against the chart. If the cold pressure is well above the specification, and the hot reading was lower than the specification, you may have the wrong viscosity oil in the engine. Change the oil, making sure to use the proper grade and quantity, then repeat the test. Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.

Sep 09, 2010 | 1996 Mercury Cougar XR7

1 Answer

When driving my oil pressure gauge and tachometer does not work


if its not a fuse check the speed sensor for the tach, and the oil pressure switch on the side of the engine block see if the lead came loose

Mar 21, 2009 | 2005 Chevrolet Tahoe

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