You could go with 914 gauges with new silkscreened faces and chrome bezels. They are designed for 4 cyl air cooled engines. senders are available, and the speedo is accurate with the left wheel front hub drive cable. The gauge faces are readily available ready to install ($30). The chrome bezels are avail but not inexpensive ($125?).
With the MB gauges - you'd need a tach from a 4 cylinder (I doubt they have selectable switch on back for # cylinders like new replica gauges - a 6 or 8 cyl won't read correctly). I assume the MB tach is electronic and not mechanical cable driven like early 356. The speedo would probably require regearing. Did MB measure oil temp?
Before- (not mine)
After - (white faces but others avail)