ok I got a second hand gt 2.0 pro. I havent been able to get it to work since I have owned it. Im using a spektrum dx3r in case I have something set on the radio wrong. But I cant get the speedo to power my rx without the use of a external bec. But even with the bec connected I cant get the speedo to set to my radio. Im programming it exactly the way the directions say to do so. Have the radio on, holding down the set button and then turning on the switch. I have a red light blinking when I do this. But then I click the set button to set neutral and there is suppose to be one green light flash after I do this and I have no lights after I click the set button. Im lost here