Yeah thats what i was thinking too, i got a GPS unit doing the speed for me but thats pretty dodgy...:0 so i gotta make the time to put the abs in...fun times ahead i think...... Hi, I checked it and yep that would be the reason. The 2ZZ rollas get their speed from the ABS unit while the 1ZZ rollas get it either from a speed sensor on the gearbox if they don't have ABS or the ABS unit. The speed sensor has three wires going to it. You may be able to get it from your 1ZZ and mount this on the 2ZZ gearbox, but there may be no place to put it. Some Celicas running the 2ZZ did not have ABS so this may be another option to explore. You may have to wire up the ABS with at least two sensors ( probably the rears ), power and then get a speed signal out of it. It will be in an error condition but should still supply speed.