Abstract: The apparatus for monitoring and recording operational characteristics of heavy or medium duty vehicle power steering systems and a method of using same in testing the operation and response of a steering system in a heavy or medium duty truck including school buses. In its most basic form, the apparatus is comprised of a data collection computer means for collecting data input and displaying output data, a steering wheel rotation measuring assembly, a driver side pitman arm angle measuring device, a passenger side wheel turn angle measuring device, and a driver side wheel turn angle measuring device. The apparatus is generally installed on a temporary basis for troubleshooting and analysis, however, the steering wheel rotation measuring assembly may be permanently installed on a vehicle to give the driver an accurate indication of steering wheel turns or an alarm when the wheel has been turned to its maximum value.