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All went great, easy to do easy to install. Both oil pressure and water temp have stabilized to reading in the middle of the high and low where they used to read. But gas gauge was unaffected, still reads full for 130 miles then by 180 miles it is almost on empty.
You have a bad sending unit then. Or, the gauge itself is bad. Short the wire to the sending unit to ground and the gauge should read Full. That's the best test I can suggest.
You may have gotten the wrong sending unit. There were many different ones, as shown here: Fuel Senders & Pumps - ???Gary's Garagemahal. Or, yours may be improperly adjusted. In any event, it appears that the float isn't going to the top of the tank, which causes it to read Full for a long time. Then, when the tank is getting low the float finally drops and it goes to Empty.
All the different trucks I have had read the fuel level differently. I chalk it up to the personality of the truck. The one I have now, the rear tank reads smooth and pretty consistent, while the front tank will stay beyond the full mark for a long time, and then when it starts moving, it moves fairly quickly. When it gets to 1/4 you had better start looking for fuel. As long as it does all this consistently, I can live with it and not run out of fuel.
I guess the point of my post is your problem is not a unusual one.
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