TPS is throttle position sensor, tells the ecu how open the throttle is, if going to a L8, which is better than a L6, you ideally need to change the tps for the L8 one, the L6 one will work but won't get the best out of it, also if the loom is a L6 loom you need to reverse the other two wires on the tps to suit the L8.
tabetha