2.) You will receive a "cold" reading of your oil temp in the pan.
Would you get an accurate reading behind the bumper with the air circulation that occurs there?
I have a cheapo ricer temp gauge in my car and have no idea where to hook it up. I was actually just searching for options the other day...And this does seem like a godsend...But during the winter months your reading will probably be a bit different due to outside conditions and being farther away from the motor don't you think?