Gps module with ADU7 for speed input

Hi I have a old volvo 740, which has a 12 tooth tone ring in the diff for speed. The accuracy is not great, especially at higher speeds, i was wondering if i could use a ecumaster gps module for the speed input to my ADU7 display? If so great, else how do i configure the ADU7 to use the diff sensor?

Thank you

Of course you can, that’s a basic feature of the GPS module.

What do you mean by accuracy?
Is the speed value off, or is there noise in the signal?
Can you upload an ADU project and log file from a drive?