Is there a way to adjust the brightness of the dash light on aHisun 750 sector?

My neighbor has a Tracker from bass pro shops. It is the quietest I’ve heard. You cannot hear them coming down the road. Riding in it it’s really quiet compared to my Tractor Supply Big Horn. My neighbor hood has mules, Lowe’s version, and big horns. The tracker is the quieter 

I repaired a bare wire on injector #1 and new O-rings on injectors, ran ok not full power but when warmed up after 5 min or so it starts to surge  and won't rev up given full throttle or not no matter what gear is selected, every once in a while it will gain power then lose it again. Doesn't back fire anymore. Any ideas or suggestions other then burning it down. 

MY 400 is gutless. I would like to know if I can upgrade to a larger engine ?

Can never go wrong with a HONDA