The outside temperature gauge has nothing to do with the engine temperature gauge. The external temperature gauge gives faulty readings when it is moved from its stock location, i.e. to install a intercooler or an oil cooler. It needs to be in direct fresh air several inches away from other hot components.
The engine temperature sensor (coolant) is threaded into the water outlet piece. To find it, follow the hose that goes from the radiator cap towards the engine, away from the radiator, the piece that you arrive at is the water outlet pipe. Move your hand a couple of inches to the right and you will see the sensor with wires sticking out. The sensor is fairly fragile, so if there is a chance it has taken a beating I would just replace it. A new sensor is $25.
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