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Hi David, for the gauge problem I would start by cleaning or replacing all of the fuses in the fuse box. Poor fuse connections will cause all sorts of problems on the SL.
Can you describe the no start? Is it cranking but not starting?
Ok, clean or replace all of the fuses first. Next you will need to check if the fuel pumps are running when you crank the engine. If the pumps are not running you will need to replace the fuel pump relay. The relay is located behind the glove box.
Hi David, I'm just following up with you on the Mercedes. Do you need anymore help with this?