Apologies for not getting these up sooner but as promised here’s the photos of the Tacho wiring on my 900.
There are two three way connector, one male and one lady (female) type with an in-line fuse which yours does appear to have.
Basically it is a ‘plug and play’ item which plugs inline with the left hand igniter box as shown.
Hope that helps but if not I can take more photos or try to answer any further questions you may have.
