Only thing I can address would be the dip stick. I'll assume the engine vent tube or breather cap,whichever it has,is plugged. Sounds like excessive blowby,possibly from the rings being partially stuck from sitting. When the pistons go up on compression,it's leaking by in to the bottom end of the engine and that pressure has to go somewhere,so it blows the dipstick out.
The temp gauge issue could possibly be a bad ground wire to the gauge.