It’s a pressure switch easy to install but the washers that come with it are painted? Don’t know what’s up with that because brake fluid eats paint. So will probably leak so I replaced them with copper washers. But easy install and wiring. Best part about these is no adjustment needed like stock switch just pull your rear banjo bolt and screw this in(washer on either side of the brake line and bleed it. Pump the brake after bleed and good to ride!