I used a MUI 30, with the current wire let into the pump wire (brushed motor, cannot do it with the newer brushless pumps) and the volts wire connected to the turbine battery. Flameout alarm if current was below a certain amps, low voltage alarm if battery below a certain V. Low fuel warning if mah goes above some value but this can be much affected by how much you run on the start up tank before disconnecting it so it was only a backup in case I forgot to start the flight timer.