Bought as a direct replacement for a gauge I ruined by running the outboard with no battery.  The engine has no voltage regulator and the the voltage went quite high and burned out the meter.  The gauge is comes with all the hardware for installation and the backlight works well but it's accuracy is a bit lacking.  Using a volt/ohm meter (fluke 85) on the back of the gauge shows the gauge reads about 1/2 volt low.  Not a big deal as it's more for telling me the battery is charging than the state of charge but disappointing none the less.  Construction is a bit "economical" so time will tell if it will hold up but I would expect to only get a few years out of it.