Abstract: In the field of engine-powered vehicles is desirable to monitor vehicle operating parameters and provide a vehicle operator with an indication when the monitored parameters enter undesirable operating conditions. It is further desirable in many instances to provide a visual indication of the relative magnitude of the sensed parameter which is in an undesirable operating condition. The subject invention provides an apparatus for monitoring the operating condition of a vehicle of the type having a plurality of sensor devices for sensing separate vehicle parameters and producing respective parameter signals responsive to the sensed parameters.