Originally Posted by mmwjr
Typically one removes the sending unit and matches it a new one. They also sell units that have an adjustable arm so you can set it up to match yours. These can be bought online or at any marine store such as West Marine.
PS: don't attempt to replace it if the tank is full wait till you get down to 3/4 tank or less to ensure gas doesn't spill out.
Ditto. This item is so infrequently changed, I'd be surprised if anyone has this info. on hand. It will get replaced every 15 - 20 years, or more in some cases. I'd bet the majority of folks have never had to replace one ever. As for the 3/4 full tank, this would especially be the case if the boat is not sitting level. If the stern is a little low, fuel will be sitting more toward the aft end of the tank. Remember that it isn't sending fuel to the carb, it is only sending a reading to the guage. This can be replaced in the water.