Ok i have just come accross the exact same problem to discover the G1 V5 has no speedo output.
This is the gauge i had intended on using
Ok so what options do i have?
Can the software be upgraded?
How would you nowmally run a speedo of a link G1 V5? mechanically of the box?
Can i get an adaptor for the mechanical gbox drive to send to the speedo?
or use a bike speedo?
the gauge i have can be calobrated on the back of it.