Sorry about my post last night I was feeling defeated and frustrated,, the amount of time that I have given to this issue is insane. I do indeed have a trouble shooting light along with various VOMs both analog and digital an oscope and digital frequency counters so Troubleshooting equipment is not the issue as much as lack of knowledge. I do have a manual but unfortunately it's not the holy grail Bentley manual, it got me through a transmission swap but has proven useless on this issue. I stated in my original post that this issue started when my son let his battery completely discharge on several occasions, we have replaced the battery witrh a brand new unit. I have been keeping that battery fully charged but it will only last so long with the key on while I stumble around with the computer and other test equipment. Brown outs are a notorious culprit of destroying electronic components, those poor little circuits get very confused if it's not a 1 or 0, 40 % of the expected voltage is far more destructive to logic circuits than 110% , agreed. I am having an issue understanding how using a VAG-TACHO after the problem appeared caused it to begin with , did the car some how know what lay in it's future?
Today I am going to start from square one, after getting the new scan from the vagcom last night it seems my issue has morphed into an additional or at least a different problem. When the issue was the immobilizer the car would start for a second and then cut off, now it just cranks and cranks. It gives me the feeling that there is spark issue so I will pursue that as if the is working and see where that takes me. The one thing I have on my side is perseverance, I will figure this out, I really have no choice so whatever it takes I will do, thanks again for your time and patience.