Garmin LVC 18x OEM

Hi! I’m currently searching for the best way of connecting a Garmin LVC 18x OEM to the Turris Omnia. I’m able to hold a soldering iron, but need help what is needed to get the RS232 and PPS 5V TTL outputs right for the UART and GPIO pins.

I found this
http://www.satsignal.eu/ntp/Garmin/18x.html
for the RasPi and was wondering if this will work on Turris Omnia as well? Maybe with a 74HC4050 instead of the converterboard used there?