no osd

FC: MAMBA F405 MK2 Betaflight Flight Controller VTX: Rush Tank Cam: Foxeer Predator V4 Mini Camera (1.8mm) (Red) So I was upgrading my first build by switching out the camera and VTX so something a little fancier but I am now having trouble getting my original OSD back. The betaflight OSD...

Hi everyone, I'm about to make the jump on my first quad build and wanted to do the UAVfutures $99 build. The only thing I noticed is there is no OSD in this build and I'm really concerned about frying my batteries. Is there a way to know when to stop without OSD? I see other FC's that...