What is an Intake Air Temperature (IAT) Sensor

The Intake Air Temperature (IAT) Sensor is used for calculating the Air Mass-Volume for the incoming air in the engine so as to ascertain the perfect air and fuel mixture for the perfect internal combustion. The experts of Jsk Automotive have put together a blog explaining the purpose of Intake Air Temperature (IAT) Sensor in vehicles.

Source: https://goo.gl/J4yVsZ

What is a tachometer and how it works?

A tachometer is a sensor device in a car used for measuring the speed of an object. Predominantly, they are used for measuring the rotational speed of a mechanism which is mainly the engine shaft in a car.  To help out readers understand tachometers better, Jsk Automotive has put together a blog explaining everything there is to know about a tachometer. 

Source: https://goo.gl/qiDqa1