Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 27Get this manual
HONDA BFBOAS5A
OIL PRESSURE TEST
1) Check the engine oil level (P3-112) Remove the mm screw and oil pressure switch,
3) Install the pressure gauge attachment (special tool) on the
oil pressure gauge that has scale calibrated maximum of 0-7 kgcrn2 (0- 100 psi) scale and on the outboard motorCAUTION
[ PRESSURE GAUGE
ATTACHMENT
Tighten the gauge attachment N.m (0.9 kg-m, 6.5 ft-lb)Overtightening will damage the threads