electronic ignition units for 912 80 hp and 100 hp ; differences

Check Rotax parts catalogue - If part numbers the same, it is reasonably safe to assume that they are interchangeable.

Be aware that Rotax have upgraded the 912ULS (100 hp) ignition system to what they call "Soft Start". This system involves both ignition modules (black boxes) and fly wheel (ignition timing sensors). I do not know if the same was done for the 912UL (80 hp).

There area various different variants with different connectors. I have seen someone on afors.com who sells adapters to allow you to mix and match.

Hi Kevin, thanks for reply. Could you give me the link where there are adapters to allow me  to mix and match various different variants with different connectors ?  I tried to find them  on afors.com ,but nothing.....I cannot... Thanks

Here's the advert although the pictures are missing now:

https://afors.com/aircraftView/31063

I've attached a picture that I captured off the website a few years ago as it looked useful. The seller was

Ian Pilton:- +44 (0)7813754802