What is Reddit's opinion of Gardner Bender 20-2218 Tap Splice, 5 Pack, Red (22-18 AWG)?

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I used one of these. You can use it to splice together the gray wire on the back of the headlight switch with the wire marked for the dimmer on the P3 control box. Gray goes through the open channel, the dimmer wire goes through the closed one. Takes only a few seconds. Just a heads up: if you use the OBDeleven app "Scandinavian tail lights," you'll need to turn it off to get this to work properly. And don't forget to change the display dimmer setting on the gauge.

Alternatively, you could just dim the display by pressing the button on the gauge for a few seconds, but I'm lazy.