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This is the response I received from Alafia @ Rochester Gauges last May:

To get a direct replacement you would most likely go back to the tank manufacturer or the boat manufacturer – this is a custom gauge and usually is made specifically for a company.
We do have adjustable gauges in this series for top mounting, and we have customers that keep stock of the gauge.
McMaster Carr has this gauge but it has a threaded adapter (1 ½”) that can be removed and you can use it.


This only has a 3” stem and a 30” float arm that can be cut down to the size of the tank.
You can reach McMaster Carr @ 630-834-9600 part number 3718K73.
www.mcmaster.com