:It must: :-Integrate with / display Haltech data output :-Have bluetooth connectivity (android phone supplying all my favorite NKOTB jams) :-Excellent direct sunlight visibility (south Florida, duh) :-Not look like surplus starfleet whizbang crap :
The only problem i can see coming up is with that first one. The only solution i know of is using the vga output off a GaugeArt. That into a vga->composite adapter into pretty much any headunit should work. But its one way. Have you considered building a carputer?