OK, I am all set for now. What I have done.
I removed the ALDA and plan to leave it off at least for now. I think if I drive with some sense I'll be OK. I have a boost gauge and the pressure swap on my turbo that begins to dump the turbo at 14 psi. I took it for a 30 mile run today and just love the car. I am not a lead foot and fairly well in tune with the car so I am going to chance it.
Since the ALDA is off, I just hooked my turbo wastegate pressure line into where the ALDA used to take it's signal from the manifold. Very simple and clean. I'll need to keep any eye on that connection to keep it clear of crap from teh manifold.
Here is a quick topside view youtube video of what I have currently.
Mercedes turbo - YouTube
Long term (the next glowplug change probably), I will have the manifold cleaned out and now with the EGR gone, it should then stay nice and tidy. I'll also probably put a nipple for the pressure signal over on the flapper tube section or possibly at the EGR flange if I remove that and put in a cover plate. Both seem like superior places than what I have but for now this will work I think.
So what caused my problems in the first place. As some suggested, my ALDA was NOT getting the boost signal as I had erroneously assumed. When I pulled all the plumbing out, I found the line was completely clogged. There is a small green hose connector in between a straight line from the intake and the Y in the line that goes to the ALDA and the B5/1 pressure sensor. That connector is the smallest point and was chucked full of the manifold residue.
Here is the whole set up, not sure if you can see that connector or not. It's right between the two metalic hose clamps in the pic.
I cleaned it out with some brake fluid.
Here is what came out of that!
I guess it's no wonder it didn't work!!