Sea Dog Instrument Hold Adapter, Black. This Instrument Hole Adapter Black allows you to replace an unused 4" gauge with two new 1-1/8" style gauges. Installs by placing the face plate in front of the dashboard then inserting the socket/meter in the hole with the washer behind. Designed with D-flats to prevent gauges from spinning, the assembly is held in place by the socket/meter nut for a clean finished look. Constructed of UV resistant injection molded nylon.

Adapter outside diameter: 3-3/4"
Instrument holes: 1-13/16"
Adapter thickness: 3/16"