Hi all, I'm currently doing a wasted spark Megasquirt conversion on my EFI 76 bay and have retained the following original components fuel pump fuel pressure regulator throttle body (I've had this fully re-machined, new spindle bearings, new butterfly, and a BMW throttle position sensor installed) intake runners intake/injector manifolds intake "airbox" Bosch EV1 style injectors (although I have swapped my originals to the later T3 injectors p/n 0280150206 as they are high-impedance are therefore don't need the resistor pack) Parts I am adding are Megasquirt ECU and relay board Crank trigger wheel and sensor from thedubshop.net Intake air temp sensor BMW throttle position sensor as mentioned above 2 wire cylinder head temp sensor (the original was 1 wire and used engine ground so i found one from a BMW motorbike that has the same thread and pitch of the original but is a 2 wire design) 4 Coil on plug ignition coils from a Suzuki R1 My own purpose built ignition coil driver unit using 4 x BIP373 IGBT to drive the COP's A warmup air valve re-purposed from a mercedes fuel tank purge valve that will allow extra air into the intake airbox during warm-up, basically it replaces the original "auxiliary air valve" I've chosen the parts based on various blogs and examples that I found whilst researching the project so i'm pretty confident it will all hang together eventually, fingers crossed... BUT my main question is this, what is the wiring polarity for the injectors? I cannot seem to find a reliable source and I've sold my original loom so cannot deduce it from that, I guess technically it doesn't matter as an injector is just a coil/electromagnet but i want it to fit "standards" if possible? Any help would be much appreciated, I do intend to put a build log on here once i've got it running to help other people thinking of doing the same thing. Cheers, Deano.