How to remove gas tank

Are you sure the failure is in the display?
Couldn't it also be failing in the gas tank, or in the "Speed Sensor"
Or even a fuse.
Just a thought.

youtube will show you in detail, search tank replacement or speedo replacement it is there.

yes. speed sensor for speedometer and gas level sensor for gas gauge

First, get most of the fuel out of the tank. Remove the chrome housing from around the speedometer. Just remove the one bolt near the bottom, should be a allen head bolt. Then lift the bottom of it up slightly, and wiggle it forward to get it off. Then wiggle the speedometer off the same way. Don't forget to take the connector off the the back of the speedometer. Just push the little ear in the middle, and wiggle it off. There is another connector just under where the speedometer was. It is in the space by the frame under the front of the tank. Disconnect it also. Look to the right of where the last connector was, you should see a little hose connected to the fuel tank. Remove it also. Remove the seat. Remove the 2 bolt's at the bottom of the fuel tank. Before removing the tank, on the left side, remove the coil cover. It is just under the tank. Depending on you're bike, it should be chrome. There is only 1 phillip's head screw to remove, (or should be). Wiggle it straight off toward you. It should come off real easy. Look under the fuel tank, you should see a fuel line connected to the fuel tank. Look for the red connector. Take a flat head or slotted screwdriver and remove the little red clip till it comes out a little. It does not come all the way off. Then the fuel line should come right off. You might have to wiggle it a little. A little fuel will come out, but not much. Then look under the tank where the fuel line was, you will see some wire's coming down from the tank. Remember where you took off the chrome coil cover? There should be a connector to disconnect the wire's. You can follow the wire's down until you find them. I had a difficult time to remove it. I had to end up cutting my wire's one at a time and putting some spade connector's on them. This make's it easier to remove the fuel tank in future cases. The tank should come off now. There might be some more connector's or wire's to take off as every bike is usually not the same. Hope this help's.

If I recall, there is a foam strip under the speedo. If your tank was repainted, it is likely the foam strip was removed and not reinstalled.

First take the trip meter reset knob off the speedometer. Then remove the center bolt or nut from the middle of the console just below the speedometer. Work the console cover off of the speedometer. Remove the seat. Remove the fuel line from the fuel petcock and drain as much fuel out of the tank as you can. Once you get as much fuel from the petcock, disconnect the "cross-over" fuel line at the front of the tank. Catch as much of the gasoline as possible.

Remove the two bolts at the Front of each tank and the one at the rear of the tank on top of the frame remove the tanks one at the time. There is a vent line that connects both tanks that crosses underneath the dash.

You need to remove the gas tank to access the plugs.

*Remove the rear seat
*Remove the front seat
*Remove the single bolt holding the tank on
*Remove the 3 screws holding the speedometer on, left the speedo and unplug the wiring harness
*Disconnect the fuel line on the left side of the tank
*Lift the tank and unplud the wiring harness from under the tank (California models have an extra hose to disconnect
*Carefully lift the tank up and back to remove the tank from the bike.

with the needles off and the scanner set to calibrate the speedometer and all the rest of the needles need to be installed at 1/2 full range with the system on unless otherwise noticed by the scanner.

First, remove the seat and disconnect the battery. Disconnect the hose at the bottom of the gas tank. Place an approved container on the ground and allow the gas to drain out of the tank until empty. Remove the console over the speedometer assembly.Remove the bolts connecting the tank to the frame. Remove the screw in front of the seat, at the back of the Harley-Davidson gas tank. Lift the tank up a little bit and disconnect the wiring harness from the tank. Lift the tank off the frame, taking care not damage the fuel line connections on the tank.

There is no fuel pump on a Harley Fat Boy.

Looking at bike bandit . com the tank can be rasied to remove and unplug just one big elecrical connector and the tank can bee removed with the cluster still on it.