I have been using the Trail Tech Vapor. It has a tach, plus water temp, odometer, speedometer, clock, etc.
We install them in two places. On 2008 models, we put them in the center of the dash where the indicator lights are. On 2009s or vehicles that already have something in the center of the dash, we mount them on the steering column area, behind the steering wheel.
I get them from HRT Motorsports. HRT also has brackets to mount them in both locations. The price for the Vapor itself and the brackets is cheaper than you can find anywhere else.
I'll try to get some pics today.