I am installing an aftermarket gauge set up. I will be building the dash bezel out of fiberglass. My main concern is the fuel gauge. If you have ever owned an older Chevy truck you know about their more than common issue with the bouncing needle. In my experience this is generally caused by a bad ground and sometimes a bad sender. I plan on running a new wire to the sender. I was just wanting to get your opinions on whether I should cut an access panel in the floor over the sender or is dropping the tank a smarter solution? I would like to build a nice panel and seam it in to match the existing floor panel. Thanks in advance to all who respond.

This panel would be wall to wall to allow access the air tanks and compressors. These components will be mounted to the frame. Of course this panel will allow ease of access but I don't want added noises or fumes in the cab of the truck.