Mercury 800 Intake Bypass Transfer Port Cover Plate 80hp 57752 Outboard Parts Oil Pans Gauge Part Number 278-000-502 /

Gauge Part Number 278-000-502 / 278000502

3927796AE / OMC 384104 / 0384104 / Volvo Penta 3852220

Yours should look just like this

Roughly 14" Diameter

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 Gauge Part Number 278-000-502 /Item 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