I think you are now challenged to show us the best and sexiest way to do it. Its nothing, just plug it into any 12 volt
receptacle or better yet, chop the end off and hard wire it to your fuse panel so you read direct from the converter (Or batteries when they back feed when you are not connected to the grid). Ironically the neat thing about 12 volt
systems is that you probably wont hurt yourself experimenting.