For anyone interested and that is decent with ASM, you can use the 'patch/add' in the following template source in the last ASM of the pretty speedometer code to display the velocity instead of the normal engine speed. Adjustments to the current speedometer source and adjustments to the register values shown below will need to modified accordingly.
Code:
.set playerbase, 0x80XXXXXX #Adjust this the playerbase of your region, too lazy to find and post the 4 addresses
.set SLOT, X #0 thru 0xB #Adjust this to your liking, Player 1 offline slot is always 0
#r11, r12, and f13 are just example registers, change them accordingly
li r11, SLOT
lis r12, playerbase@ha
lwz r12, playerbase@l (r12)
lwz r12, 0x20 (r12)
rlwinm r11, r11, 2, 0, 29 #r11 = slot
lwzx r12, r12, r11
lwz r12, 0 (r12)
lwz r12, 0x8 (r12)
lwz r12, 0x90 (r12)
lwz r12, 0x4 (r12)
lfs r13, 0xE0 (r12) #Velocity now in f13