About which component are you talking when you write "Roadmaster universal brake switch?" Do you mean part number 751000 (links here
The "universal" switch instructions indicate that a "home" position setting process is needed to prepare the switch. I assume you already did that.
Roadmaster sells a "non-universal" switch; it appears to be specific to a particular make/model. Here
is one example. (Picked off the Roadmaster "FitMaster" Web page for 2019 Ford Fusion SEL, here
. May or may not apply to your Fusion. Confirm for yourself.) That switch uses a plunger instead of the "visual" movement indicator that the "universal" switch uses. It is much like what "Dutch Star Don" wrote.
As near as I can tell (see owner's manual, here
), the Roadmaster Even Brake comes with a wireless brake application display for the motorhome dash. They call it the "ICX" transmitter and receiver.
In addition, and for cars that need it, Roadmaster apparently bundles the Brake Light Relay (link here
) with the Even Brake.
The Even Brake owner's manual (above) does not include a wiring diagram for the ICX transmitter. The Even Brake installation instructions here
tell (on page 5) how to wire the brake light switch or the brake light relay to the input of the ICX transmitter. I assume, if you used the "universal" brake light switch, that you did not install the brake light relay in your Fusion. Let me know if that assumption is incorrect.