Festiva WF Ignition Timing.

[Chilli Red]

Hi guys just joined up and could do with some help.
Got 1999 Festiva Trio S 1500cc B5 eng and need to ground the ten terminal to check the ign timing. I know how to do it on pre 99 cars but mine has got a different shape diagnostic plug. I could take it to a workshop and pay them to plug in a computer but would prefer to do it myself if poss. I'll try an attach a photo of the plug to this post if I can work it out.

Cheers.