Both Sen. Daniels & David have bills to repeal the auto sales tax that was imposed in 2017. Gary Richardson fought at the supreme court, but they rationalized that it's not a 'revenue raising' bill if the language removes exemptions. Gary and others argued that if that's true, then the Oklahoma Tax Commission identifies $10Billion that the legislature could raise in taxes by removing exemptions. Yet the people passed an amendment banning this.
What the legislature did many years ago, was exempt auto purchases from sales tax(added on to the final sales price) by imposing an excise tax(included in to the final sales price). It was done so a consumer could get financing to cover the registration fees, in the price of the purchase.