Setting the IP timing on an MB diesel is pretty easy, IF you have a 1982 or newer engine (except the 240D). There is a "lock" tool that you insert in the side of the IP, it will fit in place when the IP is at 15 ATDC. Fiddle with the pump rotation & the crank at 15 until it all lines up, tighten down, rotate a few times to check, and you're done. The OM60x engines are even easier because there is a turnbuckle to rotate the pump exactly where you want it. The lock tool costs ~$25 from the dealer. There is a different tool that allows you to move the pump & engine with the tool in place (which you CAN'T do with the lock), but it costs ~$250...
Both are much easier than dinking with a dial gauge like the VW though!
Regards,