Question about 1992 Mercedes-Benz 190

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Feul temp oil pressure gauge not working

Fuel temp and oil pressure guage not working

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This problem sounds like a bad ground to your gauges first check your fuses with a test light take the end of light ground on battery with a long wire with alligator clip on end so you can reach around to test second thing take probe tip touch pos of battery to make sure tester lights then test all fuses first both sides most fuses have two little holes one on each side on top to put probe on fuses should light up on both sides some fuses wont light on both unless the ignition is turned to acce or for instant a headlight switch has to be on to test fuse if fuses check out okay you will have to get into the gauge instrument cluster possible if these gauges are pushed into a pin type or flat circuit board its possible loose scews and a good bump would make a bad contact in the cluster

Posted on Sep 11, 2008

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Location of sending unit for water temp & oil pressure 95 geo metro 3 cylinder


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I have a 1988 ford f-150 custom with a straight six with a 4 speed manual trans. the fuel gauge and temp gauge is not working but the speedometer and odometer and oil pressure is working what could it be?


could be the guage itself, the sending unit for those guages or the wiring in between. find the sending unit, should be two wires the sending unit actually changes the amount of voltage going to the guage. cross the two wires over at the sending unit, the guage should read all the way in one direction, do this for both guages. if the guage moves to an extreme position when the wires are crossed the guage and wiring are fine and the sending unit is the culprit. if you cant get the guages to move by crosing the wires, suspect the guage itself. find you a freindly garage to help w your repair. hope this is useful

Aug 02, 2011 | 1988 Ford F 150

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How to you check to see if the oil pressure guage is bad or if there's a pressure problem itself?


Connect test leads to the guage and apply 12 volts, if the guage activates upward this works, if it's the oil preaaure in regards to the oil pump, you need to hook up a oil pressure guage.

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I have a 1988 Chevy K2500, V8-350 cu. in with TBI. I have fire, but there is no fire running to the fuel pump. There is a new fuel pump relay installed and the fuse is also good. Truck ran fine, then...


Oil pressure switch puts power to the pump after it is started.

Pumps also tend to loose their ground with age. I often splice in a new ground at the pump to eliminate that problem area.

Need some votes, thanks

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Gas guage and water temp gauge do not work clock works alt works oil works guages work just not gas and water temp ?????


On the rear of the instrument cluster there should be a resistor. This is how the fuel and temp guages are limited to a certain voltage decreasing the power to them so that they dont burn out. These (voltage limiters) resistors are available seperately from the dealership.

Oct 04, 2009 | 1987 Jeep Wrangler

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2009yaris starts an runs 4 seconds then quits


Is there sufficient oil on the dipstick and does the oil pressure guage read ok when it is running. If your computer is told that there is no oil, it won't send power to your fuel pump. Your engine may be just running on the fuel which is sent at startup. Otherwise it could be a faulty temp sensor etc...

Aug 04, 2009 | 2009 Toyota Yaris

1 Answer

Temp guage read hot, volt guage reads low, and oil pressure guage tops out. Could this be a bad ground?


Possibly, i would check the sending unit and of course the wires that connect to the temp prob. They often become worn or even short out on other wires. I suspect that the gage is telling the truth and you have a blown head gasket. Check the oil for water. Check the water level and see if you are losing water. good luck

Jun 03, 2009 | 1996 Ford Thunderbird LX

1 Answer

Guages on 87 olds cutlass are not working properly. fuel does not work, temperature works but goes strainght to hot as soon as the car warms up, amp gueage discharging oil pressure not working


Hi, you will have to replace all sending units for these gauges in order to restore them to there original state. i will list the sending units and there respective locations below.

1. Fuel gauge sending unit- you will need to replace the fuel sending unit on your Olds. its located inside the actual fuel tank. there's a floater attached to this Assembly and , its broken. you will have to replace the entire assembly. you will also have to drop the fuel tank to access it as well.

2. Temp guage-- normally when this guage starts to malfunction, its because of a bad coolant temperature sensor. Inspect the sensor's wires and connections. ECT (engine coolant temperature) sensor problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the sensor itself. If the wires or connections are bad, replace them. If you think the sensor is defective, it should be tested.

This sensor is located Under hood, center, upper engine area, front of carburetor, passenger side of water outlet, mounted in intake manifold.

3. Amp gauge --- OK, this can be caused by a bad voltage regulator. i would also trace every single wire from the amp gauge to the sensor and regulator. check for corroded connectors and contact clips. replace any wire that may seem worn.

4. Oil pressure gauge-- This gauge will malfunction if the Oil pressure switch is faulty or not working. This is an Information relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges. If this switch is defective, it will have to be replaced. Once replaced, it will fix the dead oil gauge.

This device is located Under the hood, passenger side, front engine area, mounted rear of water pump. If the wires are worn or there is an oil leak near the switch location, replace it.

Inspecting all the above areas and replacing parts if needed, will fix your gauge issues.

Please rate and god bless:)

May 04, 2009 | Pontiac Firebird Cars & Trucks

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