The transmission oil temperature gage should register a normal operating
temperature range of 100oF to 250°F. Check the battery voltmeter (normal range
is 12 to 15 volts) and the fuel gage frequently. Check the rpm readings on the
tachograph for the appropriate ranges, as illustrated and described in further detail
on following pages.
If the gages or indicators show any abnormal conditions, bring the truck to a safe
shut down the engine, and investigate the cause of the trouble.