VSS with hydro LSD

I am looking to put full Type R internals into a YS1 casing I have laying around. One question though is how do I run a VSS?

The speed sensors from the YS1 and a S1 box I have won’t fit when I test the LSD in the casing and the spline count and size on the VSS driveshaft is completely different. Given that the drive gear is cut into the LSD housing I can’t change that so what to do?