The factory tool is two light bulbs. Works for them.



I've never used one anyway. Always work out the idle by ear. Idle is the only thing the TPS is going to effect anyway. If you're looking for any kind of IT relavent performance gain from the TPS you're looking in the wrong corner.
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Not really, the TPS on the S5 cars is a full range sensor. This will affect drivability thru the whole range. Mazda sells them for about $30 if I remember right.