TM 10-3930-643-10 2-2. INSTRUMENT    CONSOLE.-Continued b. Gages. total    service    hours    on    the    engine.    Use it    to    determine    service    intervals. (4)    Air    pressure    gage    (4). Indicates    the    air    pressure    available    in    the air    tank.    This    gage    must    register    in    the    RUN    range    for    safe    machine    operation. (5)    Engine    oil    pressure    gage    (5). Indicates the lubricating    oil    circulating    through    the    engine.    This    gage RUN    range    when    operating    at    full    load    speeds. pressure    of    the must    register    in    the (6)    Voltmeter    (6). Indicates    the    condition    of    the    battery    when    pointer is    in    the    low    green    area. Indicates     whether     the     alternator     is     charging     when pointer     is     in     the     high     green     area. (7)    Torque    converter    temperature    gage    (7). Indicates    the    temperature    of the    fluid    in    the    torque    converter.    This    gage    should    register    in    the    green    range during     operation. T A 3 2 7 9 10 2-5