... Jiaxing Trading Co., LTDRED-4 ZEXEL electronic controlled in-line fuel injection pump electronic speed governor testerDESCRIPTION:This products can adjust all kind ... the programme. Before left factory, all the data have pre-set well, don't change it by any way, and leads ... button, indicator lamp light, and press arrow ↑ ↓ to choose pre-set rank, and press select button again, indicator lamp power-off ...