You can pick up a Digital Horsepower Powertuner(pcm interface) for data logging and tuning. Probably have to pick a used one up because they are no longer making them(might still have some new ones in stock). You can also use HPtuners they can be bought new. You'll need a laptop for either one you choose. You can data log and tune with both.
Another handy tool is an Aeroforce gauge, you can display two parameter at a time out of like 20 to choose from. You can also buy them in pairs and then you can display 4 parameters. You can change the parameters you are viewing buy scrolling through them. They have two analog inputs for a wideband etc. They are usually mounted in a pillar pod or a HU pod. I love mine and it's nice to have because I don't always like to hook up my laptop everytime I drive. It can't data log, but it can clear dtc's.
