Originally Posted by moti
BB, you are correct look below...took from the hornet manual
Detailed description of the “Current Sensor” port
ENG VCC Connect to battery positive (Red)
CUR AD Connect to the current sensor output signal (White)
+5V +5V power supplied to the current sensor from OSD (Yellow)
ENG GND Connect to battery negative (Black
You have not interpreted correctly. The red wire is wire used by the Hornet to measure the ENG VCC voltage. If you instead feed the RSSI voltage into the red wire then it displays the RSSI voltage in the ENG VCC location. Simples. I use the AV VCC voltage display to monitor the battery voltage instead of ENG VCC.