I ended up only needing one for my turn signals. My bike is wired to connect the turn signal relay to the switch before it connects to the headlights. I'm sure you can wire them in series to a separate side, but it's much easier to run them from a 12V source in front of the switch to save space. The actual relay block is slightly larger. It takes up about the same space as a 5-pin Bosch relay, so keep that in mind. The customization feature is amazing. You can set how fast (or slow) the flashes should be.
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