how to tell variable reluctance sensor

Hi
I think we're sort of working on the same thing. I own a spider S3. There is a cable that connects to transducer and then to the gauge cluster. I am very new to arduino so I learning too. What I need is to have arduino duplicate this as a pulse generator so I can calibrate the speedo. I saw this done on a tube video but have not been able to contact the author. As you probably know this is a big problem with S3 speedos. Any thoughts? Anybody else on this forum.

Thanks