Using a Scope for Diagnostics

My son had a 1993 Lexus SC300. That thing was so complex, I bought a $300 knock off of a Tektronics from Amazon. 150 Mhz digital storage scope. After we fixed his A/C system, and cruise control with it, he learned how to use it. He's real popular with his tuner friends. I recently added a signal generator, which aids in even more diagnostics. I started out with my Dad's Simpson S260. Technology has become affordable.