Mercury 800 Intake Bypass Transfer Port Cover Plate 80hp 57752 Outboard Parts Oil Pans Yours should look just like

Yours should look just like this

2L V8 Big Block Chevy Remote Oil System (Both Bravo Sterndrives & Inboards 1998 & I think other years as well

Gauge Part Number 278-000-502 / 278000502

but better quality and thicker construction than the stock MerCruiser models since the top & base seems to be either chromed or stainless steel rather than aluminum

Mercury 800 Intake Bypass Transfer Port Cover Plate 80hp 57752 Outboard Parts Oil Pans Yours should look just likeItem Details Previously installed on a Mercury 800 80hp Outboard (Engine Serial Number: 2883921) 4cyl These were used for mercury 80hp for 1970, 1971, 1972 Obsolete and hard to find part. Freshwater used part