What is the best way to get to Dachau Memorial from Munich if we go a on self guided tour?
bus. I believe the details are in the RS Germany book.
The best way always depends on where you are starting from. Try this trip planner.
https://efa-alt.mvv-muenchen.de/mvv/XSLT_TRIP_REQUEST2?language=en
Use "Dachau KZ-Gedenkstaette" as the destination.
if you are anywhere in the downtown Munich area (near the Hbf, Marienplatz, Isartor), take one of the S2 S-Bahn (destination Petershausen) to the Dachau Bahnhof, then the #726 bus to the Memorial.
We took the S-Bahn from Munich and then the bus, as Lee mentions. It was easy to do with no delays along the way.