Plug existing gauge ports in JOES Thermo Spacer (#36025). Reduces your standard gauge port to 1/8″ NPT. Supplied with 1/8″ NPT plug. Made out of aluminum.
JOES Water Temperature Plug w/1/8in NPT - Adapter Fitting - Water Temperature Plug - 5/8-18 in Male to 1/8 in NPT Female - Aluminum - Black Anodize - Each