got a honda 2008 v6 coupe.
me and my friend put a new head unit in. and then the problem started
got light around the speedometer and rev meter, other check light are all off.
gear **** will not move, to any gear.
starter will go on, but the car will stall after start.
got a video of a person showing similar problem to mine.
please help?!

 

Check all of your fuses to make sure you just didn't blow a fuse. There is a very quick way to check fuses with a test light.

See this video.