Part ordered from Amain Cycle, Specialized part number: S194200007.
This is a remote for the 2019 Specialized Levo's top tube display. S194200007
www.amaincycling.com
The hole you drill is the black, metal plug on the right side of the head tube. You'll see the rear brake and shifter cables go through the plug on the left side of the head tube. You just have to drill a hole in the right plug large enough to pass the cable connector through. This hole will be much larger than the cable itself. I then cut a short piece of black rubber tubing, cut a slit along it to allow it to be put over the cable, and slid it down the cable and into the hole. This hid the large hole from being obvious. I did have to unwrap and re-wrap the bar tape on the left side so I could hide the cable under the wrap.
The remote unit is mounted on a short piece of 7/8" plastic pipe. I filed one end of the pipe to match the curve of the handle bar and cut a small slit on each side so I could run a zip tie around the bar and through the pipe. I pulled back the left brake hood cover and installed the pipe as close to the bottom of the brake assembly using a zip tie. The zip tie connection (head) is hidden inside the pipe. Putting the hood cover back in place hides almost all the black zip tie. My pictures don't show it but I used a black handle bar plug to close the end of the pipe. It turned out very stealth.
I haven't even thought of using the boost button on the top tube (TCU) since I installed the remote. In fact, I told Mission Control to put the TCU into Stealth Mode where none of the LED lights are illuminated after the bike is turned on. I monitor the boost level and battery status on the display (TCD).
Dave