wanted to know what needed to run the aem ems on a 99 miata and whats the best why???

 

Alternator circuit, or GM alternator controller, or NA alternator, then custom wiring or a Boomslang adapter harness.

You don't need an NA EMS either - you can use a Honda one (cheap used), and you change internal jumper settings.

Don't bother getting the ones with the built-in wideband controllers ('U' suffix), they're pricey. Just use an LC-1.

 

thanks for the help