RED-4 ZEXEL electronic controlled in-line fuel injection pump electronic speed governor tester Tai'an Jiaxing Trading Co., LTDRED-4 ZEXEL electronic ... the corresponding indicator light turn on, press ↑ ↓button to choose 4 kinds of pre-set : 5%, 16.25%, 72.5%, 95 ... 95%, press Limp home, controller output value will be 5%. RED-4 ZEXEL electronic controlled in-line fuel injection pump electronic speed ...