Originally Posted by
Matt_lq4
Depends on your pulse rate and all that but I'll make it simple as I went through the exact same thing in my lq4 swapped car with an aftermarket speedometer cable assisted pulse generator.
Go to Speedo > and under Hardware you'll see VSS P./Rev - Trans. Set it to 8.00
Also under Speedo you'll see Sensor Calibration with VSS Pulses per Mile. Set it to 10 000 mi
I played around with these parameters and basically nailed down the same speed as my Gps speedometer phone app.
Keep adjusting up or down if the speed is still off after using my values. You'll most likely be increasing the VSS Pulses per mile value from your current value to get the speed reading accurately.