Gauge help !!! Please

Bad voltage limiter

EDIT. Looked at your photo, what, 64--65--66? Built into the fuel gauge.

You have a shop manual? You can download a 66 shop manual for free here

http://www.mymopar.com/index.php?pid=31

der link:

http://www.mymopar.com/downloads/servicemanuals/1966_Plymouth_Service_Manual.zip