Sealing the CMP?

[Joe Tracker]

Help. I replaced my Crankshaft Position Sensor to correct an engine stalling problem. Do I need to put a sealant such as permatex round the sensor?

I appear to have an oil leak since I replaced the sensor. The old sensor did not appear to have any seal where it seats near the valve cover. Thanks for your help.

My engine is a 16valve 1.6 liter in a 1999 Vitara/Chevy Tracker.

Thanks

Joe Tracker