need help

I have an 05 avalanche and I'm looking to fill in my two available dash gauge spots with perfect pass and probably a real nice depth, water and air temp gauge. Can anyone recommend or point me to a website that has a gauge like that which does all of the three things, depth, air, and water temp. I know perfect pass has water temp as an available read out.

Never mind found what I was looking for, but does anyone know how easy it would be to install something like this. It says it comes with a transom mount, meaning the device that does the actual reading in the water is mounted to the transom. Does anyone have pictures of this