I'm basing my thought on 2 things, only 1 gauge is screwing up, and only the shroud is missing. I have heard of other guys running without shrouds also, but who knows what shape the radiator is in. If the fins are getting bad it won't cool as effectively, so more air is better.
By all means, fix the wire 1st, that's easy, then see how it is. I would do the same thing. Especially since I've seen how scarce and expensive shrouds are!
