Probably the switch adjustment or bad switch. If you can get it inside and close the door, with just the ignition switch set to ON, work the lever through the gears and see if you notice them flickering on at some point.
Since the 72 was the only year it was badged a 350SL (or maybe 73 as well?), I am surprised you don't want the 350SL badge on it, I know I would, since it's a bit of an oddity on why they did that. Plus the whole "concours correct" thing. I bet the judges missed that; I wouldn't have!
Gilly
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