What is all done in a tune up?

A Tune up does not apply to that car. You just follow the scheduled maintenance. Tune up applies to cars that had adjustable parts and mechanical parts that wear. Points and Carburetors for example. Notice the answers you get are all over the place..That's because Tune up on modern cars can be whatever the person using the obsolete term wants it to be and no one argues accuracy. Bottom line is you have no parts that need regular adjustment, just follow the maintenance schedule, check her mileage and inspect or replace what is due.