Digital Dash

I also have the digital dash. Installed it myself without removing the dash. The wiring you mention is really not a problem; it’s the drilling of the hole for the diff lock that was a pain for me. The remainder was just plugging it in. There was actually another thread with pictures posted of my finished product.
As far as other accessories I like the floor mat and bed mat (works great for my dog, and there is a lot of sand where I live). I also bought the factory A arm covers which I really like however I also just bought a skid plate for my Honda Foreman from http://www.aluminumproducts.com/site.php and they told me that they are working on parts for big red. If that product is anything like what I bought for the Foreman I would wait and buy from them. For a Winch, waiting on delivery now but got it off ebay for $500.00 (shipping included). The battery box, I used a factory box with a garden tractor battery (also a thread on this). Battery is more powerful and cheaper than adding a second stock battery. If I could turn back the hands of time I would go with a Moose battery box kit. Can’t find it now but I did see a battery isolator kit that I liked, just depends on where you ride. If you go for week long rides in the woods I would install one. Remember we all like pictures!

Just installed mine yesterday. Fairly easy and took me about 2 hours going slow and being careful. I didn't have to completely remove the dash but I did take all the hardware off and tilt it back a little to access the screws that hold the case in place. That saved taking off the handles and the brackets for the safety net. Couple tips from my experience:
1. Don't take the entire dash out if you don't have to. It'll save time.
2. Use a utility knife / razor knife to carefully cut the plastic out where necessary. Use a slow sawing motion and don't push hard on the blade. The plastic is very soft and cuts easily and you can be precise this way.
3. Use a drill bit for the diff lock light. I drilled from the front to the back and used larger and larger bits until I had it just right. The dash is marked for the hole so it is centered and spaced properly.
4. When you reinstall the case the first time with the new meter, don't bother tightening the screws too much because you have to take it right back out to install the meter cover and push pins that hold it in.
5. The screws that hold the dash in are torqued pretty good. I used a large Phillips head and did them by hand and didn't strip any out. I'd say be careful and use the larger screwdrivers - I think they would strip out with a smaller Phillips.
6. If you have a windshield, that's gotta come off too if you want to tilt the dash backwards. Not a big deal but a little extra time.
7. Make sure you thread the new wire tie in to the case before reinstalling as per the picture in the directions. It does make for a nice clean finished OEM look and holds the wiring up nicely.
8. I really can't believe this doesn't come standard and really, really can't believe there is no way to monitor hours for maintainance unless you install this. Honda doesn't mess stuff up much but come on - you list service intervals at XXX hours and give us no way to determine just when those intervals arrive? Hell, my $600 generator and $850 lawn mower have hour meters built in - that's all I want - don't care about the speed or miles.

All in all tho, a couple hours and some careful cutting and the rest is plug and play.