Just about all of them serve the inteded purpose and thats keeping an eye on the AFR so your motor doesn't go . I have an Autometer which came with the set-up I purchased. It matches the rest of my gauges so that's a plus but doesn't integrate as nicely into the logging unit for HP tuners. If you have a good shop you plan to take it to than they can just weld in the supplied bung and wire it up so you can keep an eye on the AFR. Congrats on the new toys. You are going to spend alot of time here... Trust me.