I had problems with mine flashing all crazy and shit because the tach sensor was interfering with everyhting or maybe the voltage input for the backlight was dirty AC power or something. idk mopeds. I just ended up unplugging the power i think.
They are neat little units. temp sensor refresh rate is way higher than the smaller guys that everyone else runs so that's neat.
also, here's a quick start guide for it.
also also, the trailtech customer support is very good should you need to contact them for more complicated issues or whathaveyou (edited)