What is the spark plug gap on a 1998 Vauxhall vectra 2.0 GLS?

There are two 2.0 litre engines that have slightly different plug gaps. You should be able to identify yours from the handbook,the X20 has a gap of 0.9 to 1.0mm. The C20 has a gap of 0.7 to 0.9mm. Don't bother if you can't identify it,just gap to 0.9mm and it will be ok.