05 Gauge cluster calibration

[kaluce]

I lowered my obxt awhile back, and as part of it, I installed the LGT stock wheel sizes. My speedo is off now. Is there any way to calibrate the speed sensor without installing an LGT cluster?

 

 

 

I read through older threads, and it looks like there was some sort of a gear assembly in the pre-CAN WRXs, but that doesn't seem to exist in the 05-09 generation. It looks like it's something calculated on the cluster itself on these models.