The choke is actuated by a 12v lead taken off the ignition switch - 12v heats the coil which moves the choke valve - about the simplest choke arrangement you can have.

I don't know about OE electric carbs/ECU, but all Holley electric choke models I've seen are ignition switched on/off.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum