AEM Tru-boost controller on 82 300D
 

http://www.aempower.com/ViewCategory.aspx?CategoryID=68

I found this looks like it has a controller and a solenoid anyway rigging this up to the wastegate or making this work?

Why do you think it is it needed?

Thats what I was wondering.

No external interface required for programming!

It looks like you could get it to work. its made to be hooked up to a wastegate, it regulates the ammount of pressure the wastegate sees by the electronic valve.

I have the turbo that u have take apart the wastegate to set... and it's 27 yrs old pretty sure it's off.. this thing solve 2 problems at once set up the boost gauge and simply install the line inbetween it and the wastegate and i can control the boost level whatever i wanted to be. and also has a override button like indy cars incase i wanna pass shoot a couple more psi for a min or 2.

It looks cool works awsome on wrx and some the higher boosted rice burners for $200 it's also a awsome boost gauge and the control aspect is just that much better.

Too Many "Franklins"
 

Outrageously Priced gimmick touted to the "Tuner" crowd.
Save your money for real Mercedes parts.

Look into a manual boost controller. They can be built out of plumbing parts and a spring out of a pen for about $10... Set boost pressure to anything you like by turning a bolt.

I used a 1" long air tool switch with a round thumb srcrew.Then put fittings for wastegate hose. $2.50 from Harbor Freight.Whole thing put together not over 2" long.