Yes the cluster just pops out. They can seem like they have been glued if in the sun a lot. I would get in behind from the bottom and push. The oil line and the speedo should be undone from the bottom before removal. Use a 14mm wrench to hold the gauge while loosening the 10mm oil line. You do not want to creat an internal leak from the gauge.
Bosch Master, ASE Master, L1
33 years MB technician