Temputure sensor for On Board Computer

[kippercopp]

Can anybody please tell me where i can find the temputure sensor that connects to the on board computer?

[davidaln9]

Which 1?? 2 I know of are
outside air temp beside right hand fog light and
Cabin temp is behind a little grill on temp controls on dash
Theres prob 50 other temp gauges for the engine