Quicksilver 79-8M6020100 Speedometer (65mph), Black / Matte Black GOCOOL3 Dimensions without bracket and knobs:

Dimensions without bracket and knobs: 9

which will work for most common sea bottoms

Manufacturer Part Number: 010-11612-00

Select chartplotters come with Garmin Navionics+ mapping

Quicksilver 79-8M6020100 Speedometer (65mph), Black / Matte Black GOCOOL3 Dimensions without bracket and knobs:Combine timeless quality and classic function with modern graphics, new finishes and improved lighting to provide enhanced style and visibility for a new generation of boaters. Choose between the Classic line with chrome bezels and white or black gauge faces and the Sport line with brushed stainless steel or matte black bezels and black gauge faces to fit your style. Product Details Manufacturer part number: 79 8M6020100 Newly designed backlight