there are tons of info on that here in Accord forum.
anyway, not many ppl go for 6 color interchangable one. it's basically not worth it. just get some reverse one from ebay. they're cheap too.
note that there're like 3 different ones(look) you can choose from, so know what they are before you pick one.

and installation;
it's really easy. i'm not sure about 5th gen, but as for 6th gen, indi. gauge for i4 auto and v6 auto are different. if u have manual, it won't matter.
now you must be wondering how difficult it'd be to do urself.
it usually takes about 3 hrs for who never done it before. i'm no handy man,
but i did it without NO PROBLEM.

here are some tips:
prepare everything before you go install. once you take apart things from ur car, you ain't going nowhere w/o ur gauge.
to put indi. gauge on, you may use "heavy duty double sided tape for carpet" you can get them at ur local homedepot or somewhere.

MOST IMPORTANTLY:
NEVER EVER take off needles. you never need to do so.