Dear jos93
Only the 6 pin circled in red rectangle should be connected. The original BLINKER RELAIS is not needed any more if all connections are done properly.
Connections should be as follow:
Pin 30 = goes to constant 12v source even with car on the off position. Take that from fuse no.1
Pin 15= goes to a switched 12 v source like the one given by cable BLACK/RED/GREEN coming from fuse no.5 that goes already to your old can style blinker relais.
Pin 31= that is a ground, brown cable already going to your old can style blinker relais
Pin 54 or also called 49a= To cable BLACK/GREEN/WHITE already present on your old blinker relais.
Pin L= left side blinkers, to cable BLACK WHITEon your steering column switch feed connector
Pin R= right side blinkers, to cable BLACK GREEN on your steering column switch feed connector.
If you want to avoid the soldering and opening of the cable connectors there are already made jumper sub wiring harness that do all that.
Write me by personal message if you need one.
Best regards
L.peterssen