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In order to tune the engine you will need to fit a wideband AFR meter. You can fit this temporarily just for tuning and then remove it, or you can leave it permanently fitted. Pump fuel regardless of octane rating is considered to have a stochiometric AFR of 14.7:1. If you use lambda instead of AFR units as recommended in this course, then the actual stoichiometric AFR of the fuel won't matter - Lambda 1.00 is always stoichiometric.