13 Button OBC retrofit 318i M10

Have any of you ever fitted an OBC to the M10 318i?

I can get an OBC from Merbeda for around R250. They have around 6 or 7 in stock. Also a bunch of the wider ones... I am assuming from a 5 series?

Trouble is they seperated the wiring harnesses from the OBCs like idiots.

Next issue... my grandfather had the cluster replaced years ago with a unit from a M40 car.

Everything works the way it should. Service lights, gauges, everything.

It is my understanding that the OBC just connects to the instrument cluster?

And also that the special indicator stalk with the OBC button is just beneficial but not essential to operation of the OBC.

Will an OBC from any E30 work on any other e30?

I have read of a coding plug. And that an incorrect coding plug would only effect the average consumption reading?

Any experiences?

#edit. Spelling

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