Hey Gary,
the link here that Atroz already provided above is the one that allows you to simply wire an External IoT relay (FAQ) to the I/O port of the Onefinity Controller with a Breakout Board Adapter that will make that your Makita Router (and also the dust collector if you want) are switched on and off by your running g-code program automatically. In a g-code program, the “M3 Sxx” command starts the spindle (where “xx” is a number >1) and “M5” stops it. With the relay connected to the Onefinity Controller and the Makita router to the relay, as described in the link above, the router will be switched on and off just like a spindle automatically.
Under the TOOL page, on firmware version 1.0.9 and later, you have the “Router” entry which you would select then. In firmware versions prior to 1.0.9 you had to choose “PWM spindle” to use a router or a laser, but now they have their own entries (with a few options invisibly set). Choosing the “Router” entry will make that the above works, since it activates the ‘tool-enable’ pin 15 that controls the relay mentioned above. Usually the relay control input works with a logical high to get activated, so you choose ‘lo-hi’. See the link above for details.