In addition to showing vehicle speed, what else may the speedometer indicate?

The speedometer in a fire apparatus may have additional functions beyond simply indicating vehicle speed. One of those functions is to show whether the pump is engaged. When the pump is operating, the speedometer may have a feature that indicates this status, allowing the operator to confirm that the pump is ready and operational while driving or maneuvering the apparatus. This is particularly important in emergency situations where the operator needs to ensure that they can deploy water quickly and efficiently.

The other options do not relate to the function of the speedometer. Water tank levels are usually monitored through a different gauge, and brake pressure levels are monitored by hydraulic gauges or warning lights specifically designed for that purpose. Engine warning signals are typically displayed through various warning lights or indicators on the dashboard, rather than on the speedometer itself. Understanding these additional functions of the speedometer is crucial for effective operation and safety on the fireground.