I am not sure what you are asking. Are you asking about installing a fuel flow sensor or a new fuel level sender? For the fuel flow you also need a fuel management gauge. You will need to run cables from aft where the flow sensor would be mounted to the helm. If all you want is to have a working fuel level reading, you should go through the steps to check the gauge, wiring and sender, These have been documented a zillion times in this forum. If the testing is beyond you skill level, the installation of a fuel floe measuring system will probably also be. Swapping out the old sender for a new one may also pose a challenge if you are not mechanically inclined. In theory the job is fairly simple but there are a lot of things that go wrong while doing the job
