1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 298Get this manual
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fJ SPARK PLUGS
WARNING OIL TACHOMET ER WATER TEMPERATURE PRESSURE LIGHT
(Sec NOlo ,)
Hed-'V'lile RedJNh itc
NonMIILL CLOSEO REVERSE INTERLOCK SWITCH