- fixed adafruit link to the correct official case

- added zero stem option because it's cool
- added hint about setting campercent for the music option

README.md

@@ -30,9 +30,10 @@ Required:
 * A mechanism to connect the Pi to the Tesla. Either:
   * A USB A/Micro B cable: [Adafruit](https://www.adafruit.com/product/898) or [Amazon](https://www.amazon.com/gp/product/B013G4EAEI/), or 
   * A USB A Add-on Board if you want to plug your Pi into your Tesla like a USB drive instead of using a cable. [Amazon](https://www.amazon.com/gp/product/B07BK2BR6C/)
+  * A PCB kit if you want the lowest profile possible and you're able to solder. [Sparkfun](https://www.sparkfun.com/products/14526)
 
 Optional:
-* A case. The "Official" case: [Adafruit](https://www.adafruit.com/product/2885) or [Amazon](https://www.amazon.com/gp/product/B06Y593MHV). There are many others to choose from. Note that the official case won't work with the USB A Add on board.
+* A case. The "Official" case: [Adafruit](https://www.adafruit.com/product/3446) or [Amazon](https://www.amazon.com/gp/product/B06Y593MHV). There are many others to choose from. Note that the official case won't work with the USB A Add-on board or the PCB kit.
 * USB Splitter if you don't want to lose a front USB port. [The Onvian Splitter](https://www.amazon.com/gp/product/B01KX4TKH6) has been reported working by multiple people on reddit.
 
 ### Software
@@ -94,6 +95,8 @@ On the next boot, the Pi hostname will become `teslausb`, so future `ssh` sessio
 Your Pi is now ready to be plugged into your Tesla. If you want to add music to the Pi, follow the instructions in the next section.
 
 ## (Optional) Add music to the Pi
+> Note: If you set `campercent` to 100% this drive will not show up
+
 Connect the Pi to a computer. If you're using a cable be sure to use the port labeled "USB" on the circuitboard. 
 1. Wait for the Pi to show up on the computer as a USB drive.
 1. Copy any music you'd like to the drive labeled MUSIC.