I'm pretty sure I recall him mentioning electric vehicles and solar cells being important for mars, but I don't remember the interview.

Elon and SpaceX have been pretty explicit about Starlink as a system for funding the development of Mars transit vehicles and initial colony, though I'm sure a mini-Starlink around Mars would be in the long term plans.

I don't recall anywhere that Elon Musk has mentioned anything about The Boring Company being used for tunneling on mars, but the connection makes a lot of sense to me, as initial colony development would probably take place largely underground as a cheap radiation shield.