^^ Same here, my needle pretty much sits in the middle when fully at running temps and then varies a little depending on what I'm really doing. Never seen it vary by much though.
No idea on the chimes without more of a description - assume you are wearing seatbelt and setting all the 'usual' things that set off chimes - doors closed, parking brake off, not parked close enough to set off park sensors etc. Mine does chime a couple times when I put it in reverse to remind me to "look completely around the vehicle" -- a little annoying, as I do, and I use the mirrors and camera, but to me that's just a "whatever" chime...
3.2 V6; Cherry Red; 17" Black Wheels; Black Interior; Ventilated Cow Seat; Trailer Tow Grp; Cold WX Grp; Tech Grp; Safety Grp; Comfort Grp; Pano Sunroof; Uconnect 8.4AN; 9x Speakers; and a Partridge in a Pear Tree!
Added: RRO Step-Rails; Rage Crossbars; Rage Stingray low profile roof cargo basket
Planned: Brush Guard w/ Winch (if I can de-conflict tech & airbags)