Average ignition consists of
a) control signal (that's Frankenso)
c) ignition module
control signal and coil is obvious, but the ignition module part is interesting, there are options
1) logic-level coil means there is a build-in ignition module. For example, LS coils or some Nissan COPs. a Any logic-level would have at least three terminals - heavy ground wire, heavy +12v power wire and a less heavy +5v or +12v control wire. Trickily part is that plug's thread could be the ground terminal.
2) plain coil would require external ignition module/igniter - that's a transistor capable of high current and tolerating the high voltage feedback.
2) rusEfi own BTS2140 module. TODO: fabricate enough of these in China, TODO: figure out good connector option
3) J701 is a cheap & plentiful single-channel ignition module. TODO: figure out connector situation See also http://rusefi.com/wiki/index.php?title=Manual:Hardware#J701_NEON_engine_schematics
BTS2140 add-on module http://rusefi.com/forum/viewtopic.php?f=4&t=286
Toyota igniter 89621-33020 - Lexus ES300 94-96, Camry V6 92-96
Similar thing Bosch 0227100211 - VW Audi 97- 05
Logic Level Options
LS coils NB2 Miata (2001-2005) COPs are logic-level, are they? These are set for waster spark - i.e. one coil sits on the plug but there is also a wire for 2nd plug
todo: need specific part numbers for logic-level COPs