You're proposing to take a turbocharger from an 86 diesel and put it in
a 90 gas engine?   Good grief!   From a practical standpoint, you can't
even take a turbo from a diesel and put it on a very similar non-turbo
engine, because there are a whole host of issues, like the engine
components in the turbos are beefed up to handle the increased stress,
diff oil cooling to handle the heat, fuel control systems, tranny shift
differences, etc.

NO NO NO NO and NO.

I would not recommend putting a diesel turbo on a gasoline engine, even
if it delivered the right airflow and pressure (which is extremely
doubtful). The reason is that the turbo on the diesel runs quite a bit
cooler than the turbo on a gasoline engine. Consequently the steels that
work for a diesel may be inadequate for a gasoline engine. This is also
the reason that diesel with turbos were developed long before gasoline
engines with turbos. The steels that were available in the 1940's could
handle diesel exhaust temperatures, but not gasoline exhaust temps. For
the most part, improved steels and ceramics made the gasoline engine
turbocharger successful in about the 1990's.

I don't know what Mercedes uses for turbo materials, but it would not be
uncommon for the diesel turbo rotor to be made of steel, whereas the
gasoline one would be made out of a high temperature ceramic.

Most people don't know it but the exhaust temp of diesel engines (the
temp into the turbo) is substantially lower for a diesel than a gasoline
job. The diesel has a compression ratio of say 20 to 1, whereas the gas
job is about 9 to 1. The larger compression ratio also means a longer
expansion ratio, and consequently a lower temp when the exhaust valve opens.

HTH,
EJ in NJ

It's not a bolt on and there are ancilliary control systems and
internal modifications to the engine.

It's be a major and expensive project to get this to work.

Get a supercharge3d SLK engine from a wreckers instead :-)