Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 413Get this manual
METERS INSTALLATION
Meters should be installed on an instrument panel with thickness of 0.04 0.44 in(2 -1 mm)If the instrument panel thickness exceeds 0.44 in(11 mm), the meter mounting bracket must be modified accordinglyTighten all meter mounting nuts evenlyWear safety glasses and drill the correct size hole for the meter you are usingUse vacuum cleaner to clean up after drilling-
I Hour ele-00-5-912(54 mm) HourMeter 39700-ZV5-800AH 216"(52mm) 1
1 Tachometer 37250-ZV7-911 31jM(60.5mm) Tachometer 37250-ZV5-950AH 338"(86 rnm) 1
PARTNUMBER
HOLE SIZE
TACHOMETER PN 37250-ZV7-911 SHOWN