Where do you plug in the diagnostic tool for a 1988 Jeep Cherokee?

Answer

as far as i know your vehicle has to be 93 through 96 in order for you to use a odb1 diagnostics tool on it or 97 and newer for odb2. If you can get ahold of a shop manual it will give u all of the sensor resistance and voltage values. also some manuals at the auto parts stores have the values in them but idk which books they are