450 SL soft top removal

I just purchased a 1975 450SL and removed the hard top last evening. However, I have no clue how to put up the soft top and it is going to rain today! HELP me! I purchased an owner's manual online and hope to receive it next week. Until then, I know it sounds like a stupid question but it is nothing like the manual Miata soft top I had before. Is it electric or manual? If it is electric, where the heck is the switch?
Thanks!