Hi and Welcome,

What you can do is:

phase 1 (~145 HP):

Get the engine is TOP condition. Change all fluids. Make sure the trany is fine.

EGT gauge

Boost Gauge

Boost regulator

Intercooler

About 1.5 turns on the full load on Injection Pump and about 500+ rpm on the max speed governor.

phase 2 (~200 rwhp)

Larger Intercooler

Larger Turbo

Myna Pump Modification. Myna is a company in Finland (Europe) that is specialized in diesel tuning. They install larger elements (7mm vs 5.5mm stock ones) as well as perform some in house tuning. Modifying your pump will cost about 800 or 1000 euros but you also have to ship to them. IIRC the whole cost of the the IP modification might run in the $2000 range.

All you need is money , time, money, will, money, patience and last but not least MONEY .

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.