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I did this mod to my vvt-i a few years ago. I made my own adaptor and use a Bosch unit from a Porsche.

Bosch Throttle Body (0280750474)
Porsche O-Ring Gasket (99711031900)
Lexus SC430 DBW Pedal (78010-24010)
@Ben_R do you by any chance have the part number for the pedal position sensor ?
 

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I'll be (eventually) setting it up with a whifbitz throttle body adapter, Bosch 74mm dbw throttle body and Lexus pedal. All run off a Haltech Elite 2500.

The pedal has a 6pin connector for pedal position - I think it's 6pin. The throttle body has a 6pin as well. Haltech uses 2pins for dbw motor, 2pins for throttle plate position, 2pins for pedal position, plus ancillary pins for 5v and signal gnd.

I've found the Bosch tb connector, just need the part number for the pedal connector.
 

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Cool thanks. I just need the part number for the connector and perhaps a wiring diagram. I still need to dig for a Lexus wiring manual.
 
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