how to replace a crankshaft sensor?

[smi8387]

'99 Disco II is throwing codes P0335 & P0336 (Crankshaft sensor Malfunction).
i wanted to order a new one from Atlantic British but i have no idea how to install it. any and all help is greatly appreciated. Thanks.
-Justin

 

[smi8387]

well i got a new sensor from dealer ($65) and was able to locate old sensor. took off the heat shield, replaced the sensor and was driving again in a couple of hours. hopefully this did the job. Thanks.