TBI Injector polarity

[AlexanderHL]

Hi

Searched forums and internet for answers regarding this, but im still unsure.

Does the TBI injectors care about polarity?
The TBI housing have different grooves so that the injectors can only be assembled one way
Each in 180 degrees rotation from the other. So positive should always be on the outside, and common ground in the center?

However the official drawings doesn't indicate this when describing the coils in the injectors, it also doesn't indicate if injector 1 is on cylinder bank 1? I assume this is the case? However the wires comes from the backside, not the front as in drawing..?

Attached photo from 89 g20 wiring manual.