I've got an AEM TruBoost (boost gauge and boost controller all-in-one)directly off my EVO for sale.
I changed over to a manual setup for higher boost since the AEM unit only reads up to 29.5 psi - if you want to read higher, there is an additional sender unit you can purchase.
Also it comes with a new boost line since I didn't want to take my old one out :)
These units are pretty pricey, but I'm asking $125 please
I'll post pics of my unit when I get home but here's a general outline of the item at hand.