Question about Dodge D150

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Dash gauges my 1990 d150. them temperature gauge and oil pressure gauge work fine but my speedometer once the truck is warmed up is about ten miles per hour under the actual speed limit and when you first start the truck and put it in gear but are sitting still jumps from 0 to 100 and bounces. then my odometer quit on me about 50 miles ago at 107,308 miles and acts like its locked up or caught. the gas gauge reads a quarter of a tank while the truck is off but as soon as you start the truck it goes down to empty. Could it be a bad ground wire?

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  • 264 Answers

Hi Trevor, sorry your having such a bad day. I would suspect you may have two different problems, it could be just one but the reason I think two is being a 1990 truck I'd check to see for sure if it did not still have the old mechanical cable from the transmission through the firewall and plugged into the back of the speedometer. If so you can unscrew it from the back of the transmission and use a drill to turn the cable. Be easy with it so you don't bend it up. Go slow at first and have someone watch the speedometer to see what happens. If it acts all crazy or doesn't work, hangs up, something like that you most likely have a bad cable. not too bad to replace you are already half way there. Now if it does work smoothly and speeds up and slows down with the drill the there is a little ( usually plastic ) gear that sits right inside the hole. You'll have to get you a little pick or needle nose to get it out but again be gentle because it meshes with another little gear in there. Go get the right one for your truck , you'll need the transmission type number, the tire size that came on the truck not the monster mudders you put on it to impress the girls because then we'll have to go and get all scientific and calculate what gear to get. LOL Hopefully that may help you there . You could have a loose ground but honestly it sounds like a short to ground. A hot wire may be touching a ground wire somewhere under the dash. You know last week when you were pulling on the wires installing the news radio for some tunes and a new CB you may have gotten something crossed up a little. If you already have the dash off anyway checking on the speed cable just turn the key on and start looking to see if you see any discoloration like where something was getting hot or if your brave or desperate use your hand like I do and feel around to see if any of the wires seem like they are getting hot. You'll be able to tell they'll be a lot warmer than the others. heck I've seen where a mouse had crawled up in a dash board and chewed the insulation off some wires and caused problems so just jump on in that's how ya learn. let me know what you find. You may just have a electrical speedometer on that truck and it all be because of that durn mouse. Good Luck. and keep us posted.

Posted on Mar 23, 2014

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Posted on Jan 02, 2017

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SOURCE: 1966 Ford Mustang Gas Guage not working

I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.

Posted on Dec 05, 2008

mcgyver468
  • 710 Answers

SOURCE: started out with headlights out then the speedometer, odometer, gas gauge, oil, battery, rpm's are not working, fixed the headlight was a fuse but other stuff still won't work.

sounds like your missing a ground somewhere.

Posted on Apr 21, 2009

Molson02536
  • 3854 Answers

SOURCE: oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

Posted on May 29, 2009

buffalonyman
  • 1865 Answers

SOURCE: oil pressure fluctuating

The sensor could be failing to read the lower pressure when the engine RPM slows down. Or the pump could be failing. I would replace the sensor and see if that doesn't correct the problem

Posted on Jul 11, 2009

  • 1 Answer

SOURCE: speedometer, gas gauge, odometer, rpm gauge not working

My gas guage, speed odometer and tempiture does not work
The speed odometre is reading 9999999 what should i do

Posted on Oct 21, 2009

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