Gerrit N

I need some advice here please. I have a 1997 Sang Yong Musso E320 EL, 6 cyl Mercedes Benz Petrol engine. It is also known as a M162, or 124 series engine. It has a HFM Trimmer plug, next to the fuse box inside the engine compartment. It is used for the Octane selection in which ever country you are in to fine tune the engine. It has 7 selections (positions). I stay in South Africa, Richards Bay and use our unleaded fuel with an Octane level of 95. Where should this selection be at? I have attached a file of information of the EZL Resistance Trimmer plug, but do not know if I should use it as a guide. Please advice.