Hi
I'm in the middle of my first reseal, just started going back together.
I think a search for "odometer fix" tells you how to fix that. Its common.
It should be faster, and is possibly sucking air through worn bushings in the front of the pump...in which case, you have to go beyond the seal kit.
Change the fuel filter and timing belt for sure.
A big reason the injector pumps leak is the switch to ULSD...if the pump was previously run on old diesel. Its a chemical interaction thing, and probably not avoidable. The new seal kit is not reformulated, but will work fine.
The seal kit is Bosch # DGK 126 for NA, DGK121 for Turbo. add an R at the end for Viton.
Parts stores, and even parts warehouses cannot seem to get this, even if you bring the box in to help em figure it out.
Ebay, or a diesel shop will have no trouble. I got mine from Diamond Diesel, just under $20. It comes with the wrong input seal (Cummins?), so you have to order that separate.
the reseal isn't "hard", but is a bit complicated. If you can rebuild a carburetor, and an auto trans valve body, you've done it all before.
You will also need a VW Diesel timing tools kit, or a clever fake.