Instrument Panel - Mech. Cont. Engines H—Key Switch - The key switch controls the electrical system. Positions of key switch are marked as follows: OFF, ON, and START. I—Throttle (Optional) - The throttle control is used to control engine speed. J—Hourmeter (Optional) - The hourmeter indicates the operating hours of the engine while key switch is in the position. The hour meter should be used as a guide for scheduling periodic service. OURGP11,0000160 –19–05FEB04–2/2 18-4 021604 PN=98