The tekin? is a diff esc, the ko vfs1.5 bmc is the same as an orion one i think the vortex, the throttle settings are done via the link usb in laptop to the receiver wire on the speedo, the software is available from the ko website, you can create your own or download one of there's to the speedo, i used the 4wd power one and worked well until the speedo got a problem and started stuttering (it was old and not in good con, got it cheap
) i had the brushed vfs1 from new and never had a problem with it
you need the ko usb link to alter the throttle profiles, i do have one i might part with, pm me.