What thomas is doing for you is auxilary fuel injection system... Can also be done with EMB/EMU, with an inejctor harness for auxilary fuel injection. All u need is the RPM/MAP and TPS signal.
But that's because u're Bolting On turbo where stock injectors are insufficient to supply the fuel to produce good mixture when boosting.
In other words, he's using a Interceptor as an external Injector Controller. Something like a Greddy Rebbit Injector Controller.
In this case as TS has mentioned, he did not went into forced induction. So, auxilary fuel injection will only mess up more.
What bout ignition timing then? I've been to a few famous tuners but apparently only GT-AUTO can get it right for me...