My dash gauge shows half way after aout 5 klm, hits 1/4 gauge about 2 klm, tm4 shows after 10 klm its only on about 50 deg , after approx 15 klm its up to 73 approx which is roughly the temp of the box also, mine has never reached past 82 deg and usually sits on 81 daylight sunny weather, nighttime max about 73,
Cheers
Ken

