The illumination of the cluster on ALL W124 cars is a problem, at least not as bright as you would expect. It will get better if you replace the old bulbs with new fresh bulbs, but even then you will want the adjustment on the max. Just one of the few negative things to put up with. The bad news is that you have to remove the cluster to replace the bulbs. That can be a challenge and if you are not careful it is possible to damage the dash or the cluster in the process. Don't ask how I know!
Likewise the gas pedal can be a bit stiff. Make sure that the floor mats or something else is not in the way of the pedal. As far as the rear window, it could be a bad switch in the door or console, the rear window lock-out switch, or a bad window motor. Since both the console and door switch do not work, I would guess you have a bad motor. This is a DIY job. Over all the 300E is a great car and one that still looks good up against newer vehicles.
Likewise the gas pedal can be a bit stiff. Make sure that the floor mats or something else is not in the way of the pedal. As far as the rear window, it could be a bad switch in the door or console, the rear window lock-out switch, or a bad window motor. Since both the console and door switch do not work, I would guess you have a bad motor. This is a DIY job. Over all the 300E is a great car and one that still looks good up against newer vehicles.