Spark sensor on wrong plug lead. Is it important?

[Albie 0]

I'm building up the engine after a particularly long rebuild and have just found something peculiar. The spark sensor which should be wrapped around the number 4 cylinder according to my PDFs is actually around number 1 lead. And to match that, the plugs are 180deg out on the distributor cap. These 2 may cancel each other out of course on an engine incorrectly but accurately timed up that way.

 

There must have been something peculiar about the original arrangement which I didn't even notice as I stripped it. Having now timed things up correctly, everything is going back where it should be, so the leads are being swapped 180deg to match the rotor arm, but is there any need to take the spark sensor off lead 1 and put it onto lead 4? Having done one of these before, I know it can be a bit of a bitch to do.

 

If it just senses a spark which it then counts for things like the rev counter it should be fine, but if it is timing things relative to cylinder 4 then it could seriously screw things up.

 

Any advice from you guys who know?

[Supercharged 2]

That sensor is there for diagnostics - it lets the ECU distinguish between cyls 1 and 4 (I think) for knock sensing...