Found this, think I'll use the PMU yikes
DO NOT power the Tarot ZYX from a ESC... Use the PMU it supplies 5 volt for the FC, GPS unit clean power, it is also in a metal shielded container, so that cuts down on any RF interference!!!!
Then it has a JST 12 volt regulated power connector out for the OSD unit, which has another 5Volt BEC for powering GoPros and FPV 5 volt cameras and 12 volts for VTX and GoPro Gimbal!
The PMU also supplies the battery info so the FC knows what battery you have installed, this is for the OSD voltage level, FC warnings and Autoland when it gets too low!!
Someone else here made that mistake and it destroyed the GPS unit!!!