Usually I'm providing tech support only for my clients but I can help you out
I use Skype (button below)
1) If connector can't stay in the housing or antenna can't lock on this connector, the best would be to use SMB GPS antenna. It is tight and it is not going to disconnect by itself.
2) It could, but fan should activate if it is too hot
3) Instrument cluster is perfect. I use ceramic antennas so there is no problems, but even if you bought different one you shouldn't have any problems either.
4) which adaptor? pics?