MBE ECU Cable and ?

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I'm looking to connect up my laptop to the MBE ECU on my 2004 T350. I'm assuming the following connector is the correct one:


I also found this 3 pin connector buried behind the dash ECU. I can't find any reference to it on the circuit diagrams. Does anyone know what it is for?
Thanks!

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Thanks Nick. Do you have the software running yourself? Any snags to watch out for?

I've also found this which looks helpful:

https://www.pistonheads.com/gassing/topic.asp?h=0&...

I'm still curious about the other three pin connector. Does anyone knows what it is for?

Stuart

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Thanks for your comments Penelope.

I've re-checked the circuit diagrams and can't see any likely candidate. It must be one of those features TVR never got round to fitting. Firing the explosive bolts on the emergency door release?

Thanks MK, I still have an old laptop running XP, so hopefully it will run on that.