Iv just borrowed a( NON CAT) gas analizer for my s2 and not sure how to use it. I know you have to be smack in the middle on nimber 1 with this machine it's a old neddle gauge not a diggy one. How do you use it does the car have to be warmed up first? do you test i on idle or on a surten rev? any info would help me alot thanks for looking

Please reply as soon as you can as im up the old girls house coz my pc has broken down