I have a hall to inductive converting module left over from a job. Long story but a lot of wiring and tuning was done by a big name workshop amd I had to re do it all. I seen the receipt for $300 for this.
It was being used to convert the speed signal from a T5 to work with a VR auto ECU.
Its been kicking around the shed for about 5 years im not sure if it's still good and im unable to test.
Make an offer via pm if interested.