[Bill in OKC]

I have not read the test plan... but I am relatively familiar with the DME after tracking down two no-start conditions. So with that, I've seen inexpensive Oscilloscopes for sale on ebay. I am pretty sure that just about any scope made in the last 10 years would have the features needed to measure any signal a Porsche can generate. From the posts I've read, it looks like you would be needing a scope to look at things like (near) square waves from the speed and position sensors - fairly slow and 12V max - well unless you want to look at the coil secondary or something. HP made good equipment until bought out by Agilent - and Agilent is good stuff. A good ebay buy on a used working Tektronics o-scope would work fine. Maybe look for a battery powered/portable scope for ease of use & storage purposes. Lots of higher-end equipment if you want to spend the money but my car is 24 years old and the best scopes would be tremendous overkill.