Our 2006 Carver 36 MY was equipped Tank watch 4 system for both tanks. They were not reading correctly, we we wanted to remove and troubleshoot.

This turned out to be extremely difficult as the sending units hadn't ever been removed since new (14yrs ago). Access and room to move was limted

I bought a gas tank fuel pump remover tool ($20 Amazon) to span the sender access tabs in order to un-screw. This allowed the use of a 26" torque wrench, as a 6", then then 16" ratchet did not provide adequate torque leverage to spin loose.

Once removed, it was apparent deposits had fouled the sensor movements. Cleaning and re-installation then had us functioning on all levels. This time I had tightened the sender, to lesson the brute force required for the next cleaning.

The use of the adjustable OEM TOOLS Fuel Pump Spanner Wrench Part number 25156 made it easy to apply ratchet w/various length extensions for the DIY's out there.