You might try this company for a rebuild:
Temp sending units, coils, fuel sending units, tube radios, vacuum advance, voltage regs. 1920s to 1970s (mostly 30s, 40s, 50s)
Atwater Kent
12 Jacques Street Worcester,
MA, 01603
(508)792-9500
http://www.mykmlifestyle.comOr one of these:
Then and Now Automotive
447 Washington St
Weymouth, Ma 02188
Ph: 781.335.8860
Fax: 781.335.1925
https://www.then-now-auto.com/Instrument, clock, gauge restoration, fuel tank sending unit rebuilding service
Instrument Services, Inc.
11765 Main Street
Roscoe, IL 61073
800.558.2674
http://clocksandgauges.com/