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OK so I have been a little busy but I have the car going now.
So in summary I got hold of some great wiring schematics and a pin out guide of what each pin on the ECU does. I cut out the old engine...

Thanks a lot John
The direction I'm taking is as you recommended to just leave the factory ECU there and duplicate the TPS signal from the LS loom & install a micro switch onto the accelerator pedal...

Thanks John
Yes I'm aware that the ECU needs to be in place as the TPS signal is passed through the main ECU to the TCM. That said I believe it can be bypassed by re-routing the TPS wiring. I had a...

Hi I have just installed a LM7 5.3 Vortec engine in a 97 Y61 with a RE4 auto. (For those who don't know they are simply a cast block LS1 with slightly smaller pistons)
I know the Trans will go into...