Hi Kirk -- welcome to the forum and yeah, that Empulse is scary cool.
A good starting point on the tax incentives is
here. Arizona has some "incentives" listed, but it defines them pretty broadly, like "HOV lane exemption." There appears to be an exemption from the Arizona Use Tax... but not for electrics! It's just for propane, nat gas, and hydrogen.
It looks like AZ isn't very EV friendly, at least when it comes to tax incentives. Hey, in Missouri they were supposed to charge me an extra $75 for licensing my EV, so at least it doesn't appear there's a disincentive like that in your state.