Can anyone tell me the torque value used to fasten down the knock sensor used on the following Vauxhalls?

Vectra 1996 - 2002
Calibra 1989 - 1997
Astra 1992 - 1998

I'm using one as a knock microphone, and I've been told that they should be fitted to a specific torque to work correctly.

cheers,
David

vectra 20nm
calibra 20nm
astra 25nm

Hope it helps.

Excellent - many thanks.

(I just want to make sure that I'm in the correct ball-park)

cheers,
David