Jon,
I'm not sure on the "ACC" switch, but I believe the "override " switch is for the radiator fan. When in override, the fan run's continually and bypasses the thermostat, very helpfull on those long uphill pulls. [Editor's note: Newell's of this vintage were not factory equiped with temperature controlled fans. Therefore, this switch would not be an override for such a fan unless the fan and switch were added later.]
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