I've found few references or guides on setting up a mustang throttle body with S300.

Trying to get the car ready to bring to a dyno. Right now it will start but not idle but if i unplug the TPS i can get it to idle. I'm not sure how to setup the mustang TPS as its 1 to 5V instead of the Honda .5 to 4.5V. I've tried scaling the throttle on smanger but it doesn't seem to make a difference. am I missing something?

This setup was running well before in another car so I know its possible.

 

TPS voltage has little to do with the idle... the throttle blade opening size is dramatically larger than a stock H22A T/B, so TUNING will be required to get the idle happy. The real question is WHY install a Ford product on your Honda when there are plenty of very affordable aftermarket 70mm T/B's available that will work much easier than what you are trying to use. This discussion hasn't even addressed what mods your H22A has and WHY in Heaven you feel a 70mm T/B is necessary for your application, so could you please provide more information about your build ?

 

Agreed.

With smanager opened and connected to the ecu. Have your tps up on display. Loosen the adjustment screws on the tps. Watch the tps display while you open the throttle plate all the way. When you see 100 percent in the display, lock the tps down in that position. Then in the tps paramemter you may have to readjust your min/max scaling. You would simply just click the read buttons