Sun Diagnostic Computer help needed

I remember our Vo-tech auto mechanics got this same exact machine brand new when I was a sophomore or junior in high school in 1986 or 1987.....But Sorry, I have no idea on how to tell you to use it, as the instructor never showed us.........You should be able to download some type of user manual online...That same year we also got a brand new computer spin type wheel balancer which was high tech for the era compared to the old bubble balancer......we were amazed at the technology........we did learn how to use that ....