Piggybacking sensor wires to feed the DFI will result in bogus values being returned to both the ECU and the DFI due to fluctuating resistance values. The only one that works is the TPS. 450cc injectors are kind of small for a car needing/using the DFI. There are other cheaper, cleaner, and easier ways to tune if all you're doing is 450's. Most of us were/are running 625's with the DFI. Are you upgrading down the road?

Greg

'19 Genesis G70 3.3t AWD
'88 Chrysler Conquest TSI