Probs one of the best things I have purchased for the car.
The facked it tels u folts as they come up is fantastic. Mine is on a suction pod so don't have it in all the time but can be interchanged between cars when friends need it.
Allso this tells u what temps the ecu is getting from the sensor so u can check fans work corectaly
Not somthing 2 take ya eye off the road. Same as looking at the temp gadge on the clocks or anbout the same time u are looking in a mirror