I tried a search but have found limited help. Can someone please explain how to adjust an engine that is running too rich or too lean? I am planning on the Greddy EGT and possibly an Greddy air/fuel guage. My mechanic friend says that the air/fuel meter is a waste as even if it is running too rich, it can't be adjusted. Can't it be adjusted by fuel pressure? If someone has the time to run through this I would appreciate it.