G'day everyone and Happy Easter!

Got a question.
If you were to do a conversion in which you put an LS1 into an old vehicle, what can be done to create a MIL (Check Engine Light)?

I think the MIL on Commodores is illuminated by serial data sent to the instrument cluster.

Any way to get around this?
Any LS1 vehicle use a pin on the PCM as a direct connection to the light?

Cheers,