Need help with gas gauge problem

[ScottH]

Finally got my 76 on the road and first thing I do is get gas. It's been sitting for about 6 months. I would start it up and move it every once in awhile. Gas gauge worked fine when I drove it home. It has dual tanks.

Now the gauge isn't moving. Put gas in both tanks and neither one moves the gauge. I switch back and forth between tanks and no gauge movement.

I figure it most likely isn't a float, one I could see but not both. Switch may not be working, or gauge could be shot.

Any suggestions on how I can trouble shoot this would be greatly appreciated.

Thanks.