I wish it could go in upside down. The bottom is recessed for the fork tube/bearing race so it only goes one way
. I'm thinking the brake light issue is one of 3 things. It's either the switch like you mentioned, I wired it wrong (I tree to wire in a front brake switch also, but I may have done the series wrong) or I need to replace my blown out speedometer bulb as the brake and everything runs in line with it Christmas light style. I'm going to tinker with it as soon as I'm able.
'70 sl350, '86 spree, '88 cressida