Gauge thread size and pitch on a Joe B Guppy

[grackleblast]

Hoping for some info here. I tried to fill a Joe B Guppy tank for a local air gunner, but the main gauge doesn't register. The small gauge is fine but not accurate enough for filling his air gun. Can any one tell me the thread size and pitch so I can help him find an aftermarket gauge ? Any help or suggestions welcome. Thanks.

Herb

 

[Odoyle]

Check the main gauge if there's debris in the hole from dust or grit or from tge junk white Teflon tape then use yellow gas line Teflon tape on the threads and dont block the hole.

If that doesn't fix it there's videos how to repair the gauge yourself.

Same principle-

Start at 1:30 AND DON'T USE LOCKTITE !!!

https://youtu.be/KAW_PIrKw10

https://kodiakcontrols.com/blog/how-to-fix-a-pressure-gauge-pointing-off-of-zero/

https://youtu.be/CCM7zdRzMFI

https://youtu.be/SvpsWjan6Wc

.https://youtu.be/h-7h652uGhg

https://youtu.be/_BxDeN8Wg84