What size hole does this gauge require? See link for wiring diagram.
The frame is 4" and the hole size is 3.375" (85mm). Here is a link to a diagram of the syncronizer.
https://www.riversidemfg.com/wp-content/uploads/2021/09/IS0079_D.pdf
Free fast delivery
Lower 48 States · ships next day
7,000+ Google Reviews
Rated 4.8 out of 5
Over 15 years trading
Trusted since 2005
Authorised dealer
Full manufacturer warranty
Expert boater support
1-888-595-BOAT