found out the motor is different 2.2 litter

http://www.asiaenginepro.com/index.php/car-engine-part/mercedes-parts/engine-mercedes-sprinter-2-2-cdi-88-150hp-om611-981-983-987.html

http://www.ebay.de/itm/Motor-Mercedes-Sprinter-2-2-CDI-60-95-Kw-OM611-981-983-987-/200955185497

Vehicle MB 413 CDI. Type of engine OM 611 981 MQ5

Kařez, Borek To Praha- Transport - Zbiroh Nadrazi

video of mercedes sprinter being serviced

https://www.youtube.com/watch?v=DstLFgr5JAs

http://autoline.info/sf/van-ambulance-MERCEDES-BENZ-Sprinter-519-Neu-New-Directly--14022123264099678300.html

link to place that sold the ambulance in Czech
http://www.medicainfo.cz/r2001/JMR1065.HTM

http://www.zzshmp.cz/?page_id=376

http://www.truck1.eu/_TEN_auto_1312305_Utility_Special_vehicle_Ambulance_Mercedes_Benz_Sprinter_519_CDI_RTW_Luftfed_Fahrtec_2xKlima.html

reality of condition

The good news is that the van is in good condition. Thing runs basically as it should. These vans had to be serviced often, so although they were used a lot, the vans are in basically good condition. The problem is that the Tachograph is not with the van. Yet i can get another one, the other option is to see if the weight might be less, so it can be registered as a regular one. In a way though, maybe its good that its of the other weight, as then i have to drive the beast, so its not going to be messed around by someone else. I'll have to see how it goes. I have a class C license, so i can drive it. So the van drives well and its a good one, yet maybe it has some problems with it as well. Time will tell.

So in order to drive a lorry you need to have one of these with the van. They are costing a lot out of Germany, yet in eBay Germany, i managed to buy two of them quite cheap. What happens with them is the battery goes dead, so this needs to be replaced and then its likely that one of them will work, so i hope that means its going to be ok.
VDO DTCO 1381 Digitaler Tachograph 12V Rel. 1.0a Defekt
trucks - Transportation Actia Tachograph smart sevel 2 Type SmarTach STD II F2
These are the two brands that i bought. Although they said they would not ship them to Czech, they did in the end sell them to me, just added slightly more for shipping. I think its all fair.