If it was me, I would just mount another hall effect geartooth sensor on your 60 tooth wheel. This way you will not interfere with the signal going to your dyno and you know what kind of sensor you are dealing with.
I am sure if you work in a race shop it would be no problem to fabricate a simple bracket to mount the sensor.
Google Cherry Gear Tooth sensor. They are around $30, depending on who you buy them from.
I just had a thought after I wrote this. You state that you are running a SuperFlow dyno.
I have no experience with a Superflow , mainly Land&Sea and Depac , but any decent dyno controller that I have ever used had axillary outputs that could be programmed in software to do about anything you could want.
I you could tell us what you want this to do when you hit 6 grand it might be a little easier to help.
By the way. Before I retired I had about 20 years of building race engines and running dyno's