A few of us have installed a Trailtech Vapor. Tachometer, speedometer, trip meter, engine and outside temp, etc.
A big advantage for me is that the speedo can be calibrated correctly, my stock one was reading quite a bit low.
So far I just have the speedo hooked up, when I finish I'll pull the other instruments for a GPS and a voltmeter.
Price w/o the turn signal unit is 129.95.
http://trailtech.net/vapor.html
Acewell also makes similar combo units.