Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 32Get this manual
OIL PRESURE TEST 7) Remove the engine cover and check the engine oil level (Pa3-212) Disconnect the oil pressure switch wire connector
OIL PRESSURE
3) Install pressure gauge attachment (special tool) on an oil pressure gauge that has scale calibrated to maxin mum of 196490 kPa (2 2871 psi) to the outboard motorCAUTION: Tighten the adapter the specified torqueovertighten the adapter avoid damaging the threads of the crankcaseTORQUE: (0.8 kgf-m, 5.8 )
4) Run the outboard motor in an outboard test tank with the water at least inches above the antiventilation plateAllow the engine to warm up to normal operating temperature (engine oil temperature 80C1760F)
OIL PRESSURE SWITCH
Engine exhaust contains poisonous carbon monoxide gas that can cause unconsciousnessand deathtf the engine must be running, make sure the area is well ventilated,
5) Measure the oil pressureOIL PRESSURE GAUGE AlTACHMENT 074064030000 OIL PRESSURE GAUGE SET 07506-300000