Called FTL today.
Explained problem with fuel gauge and that sending unit had been replaced.
They said the answer is a new gauge pod (tach/fuel/alternator). Said to explain that to dealer next time it goes in for the fuel gauge problem.
FTL said old PN was W22-00012-020 new PN to order is W22-0012-035.
Haven't tried that yet, will do so this fall when rig goes in for service.