e38 Speedo output options (LS3 swap)

Hello!

I have swapped a LS3/TR6060 (2013 Camaro) into a 1986 Jaguar XJ6. I am running speedo output off pin 57 on the X1 connector, with the attached settings. I am running it through a specialty conversion box which gives me the ability to adjust speed, and it is reading directionally correct, but the speedometer bounces.

I was told I should be setting the calibration at 4000ppm, but I don't see a specific option for that.
Questions:
1) does repTOS automatically output through pin 57 at 4000ppm?
2) is there another option here that would impact the frequency of the signal that might reduce the bouncing?

Thank you!

Attachment 162661

Not sure if there's a way to delete the thread, but this has been resolved - took it out for a longer drive and the speedo is settled and reading consistently. Apologies for the clutter!