Other Fuel System Related Problems of the 2000 GMC Sierra 2500

Other Fuel System Fuel Gauge problem

For approximately 2 years now (since 2005),my 2000 GMC fuel gauge fluctuates regardless how much fuel is in the tank. I can be at highway speed and gauge will go to empty and remain there until I place the shifter into neutral and gauge needle will move to fuel level. I've have gone to GMC and Chevrolet service depts. And both said they are aware of this problem and that I would need to purchase and adapter kit for around $150. I believe that this defective gauge problem should be recalled since there are many trucks with this problem and I believe general motors is aware of this since dealers have been having these types of trucks taken in for this repair making it known that there are many more out there. This is very unsafe especially when pulling an 9000 lb. Fifth down the interstate at night and not knowing how much fuel you have and second having to place the shifter into neutral to make it go back up. When truck is in park and idling and gauge will go to empty regardless of how much fuel remains there until the shifter is placed in neutral. Please help in any way possible , I feel this is very dangerous since I have my family with me when I travel.