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Holding tank and water tank under V berth sending units


May 28, 2013
Catalina C310 SF Bay/Delta
My gauges don't work on level of liquid in holding tank and water tank. Has anyone replaced "sending" units on tanks
using existing wiring? Searched archives several years back but no info.

Clyde Thorington
C310 #245
San Jose, CA
Mar 6, 2008
Catalina 310 Scott Creek, VA
I used the Garnet seelevel II, which at that time had battery voltage, fresh water, black water, and LPG monitors. There were no wires/senders on hull 218 to the fresh water or holding tank, so I had to run wires to each location, which was not difficult. Due to the odd shape of both tanks, they are not perfect, but it is a great upgrade, and the senders glue onto the outside of the tanks. I have still never figured out the propane sender, I think you need a tank with a sender built in to make that portion work.



Feb 14, 2017
Catalina 310 211 Lake Guntersville, AL
I don't think these were standard equipment so you need to identify the manufacturer for the correct sending units.

Tom J

Sep 30, 2008
Catalina 310 Quincy, MA
My boat didn't have any sensors. I installed Raritan sensors that glue to the outside of the tanks.