i dunno how legal that would be here... im not sure how this would work, but as far as i know an indicator works with a relay switch... the signal is sent to the relay, which turns it on, then another signal is sent to turn it off, etc etc... so you could just wire it up so the indicator circuit is constantly on, and then when you hit the indicators, the relay is putting out the same signals, but they are just reversed... or something... either way it will take a fair bit of solid and careful and complicated wiring to do it, but im sure it could be done... im guessing out of my ***** here, but it makes sense that this is how an indicator works... of course you should read up on how they work, and then just work out a way to reverse the flash... easy hey :P