Question While driving, gauges are: Answers Unreliable. Unpredictable. To be monitored for potential signs of trouble. Explanation While driving, you should watch your vehicle's gauges for signs of trouble. Be sure to inspect your gauges before beginning a trip to ensure that they are in proper working order. This questions appears in the following tests: California Class B Knowledge Test Hawaii Tank Iowa Class A Knowledge Test Iowa Class B Knowledge Test Kentucky Class B Knowledge Test Maine Tank Michigan Passenger Minnesota Class A Knowledge Test New Mexico Passenger North Carolina Passenger