Hi. I bench tested the NOS 25974 Mini 2-Stage Progressive Nitrous controller and it works fine. Handheld screen lights up and set parameters to make a test. Later hook it up and then the handheld screen stays off, all wires are set like the first test, but no screen. The controller works, but is set to bench test it. What's wrong? Can I switch to a Terminator X handheld? To only change parameters? Hope someone can help me, want to race this Friday. Thanks.