I need to recalibrate my speedometer. I know this question has been asked, but the only answer I've ever been able to find is, "you have the wrong size tires."

My z has been dropped 1.2? Inches in the back and the fenders have been rolled bc I'm running 20 inch wheels. I'm not even going to state my tire size bc I know they are the "wrong" size. I don't care. I like the way it looks. I like the way it rides. I like the way it handles. I'm not changing my wheels and tires.

So how do I calibrate my speedometer?

 

I used this successfully in my Z to calibrate the speedo

https://shop.12oclocklabs.com/index....&product_id=59

 

Thank you thekinn, nice to know that works.

Right know I'm going to consider this plan-b. I was really looking for a way to modify the parameters in the ecu. If it can be done.