It wont matter where you put it wiskey.
In terms of looking at a gauge using that information to make a decision, any time difference wont make any difference. Re temp variation its up and down all over the place but only couple of degrees.
SO put it in the most practical easiest spot, have a slug of whisky, chill out and enjoy the fruits of your labour knowing if its a stinking hot day the oil will be hot , if its a cold morning and you want to flog the guts out of the motor you just gotta wait a while.
johno