I would like to obtain an OBD device to have to trouble shoot potential error codes as I update/upgrade my '95 SL500. How many "PIN" plug does this car have? 38? Where is it located? All my other non MB cars had them under the dash. Is their a testor that is relatively inexpensive but can translate numbers/dashes into english or do you need a code reader to go with it. I don't want to spend too much and I would even look for a used one if I can find it. Any thoughts/recommendations appreciated. Steve