It is an excellent idea. Coincidentally, I just took all mine out tonight for a panel upgrade, and it was like new after 15 years. Be sure it is real silicone and not some thermoplastic that will get hard and be very difficult to remove.
I don't know what automotive application would have large enough lines for the flow you need.
I had two different ones, some braided stuff for the higher vacuum to the pump, and non-reinforced thick wall stuff for the regulated (lower vacuum) side.
RV6A N66AP 1600+ hours
Maple Grove, MN