On driving the car it seems to do fine on take-offs, actually I am surprised it didn't slow things down more. I have yet to take it up a really steep hill though. the cruising on the highway is really where it shines though, quite and plenty of power.

As for the speedometer, I found what I believe was the speedo from the same car but somebody had mangled it up, but I did take the gears out of the unit and checked to see if they will swap into the wagon and that looks good, unfortunately I can’t remember if it was a 120 mph speedo like the one in my wagon so now I’m not sure. I found this 116 speedo on ebay:

This auction is for a good used speedometer used on the 107 and 116 chassis Mercedes-Benz. This would include models such as 280S, 280SE, 300SD. 450SE, 450SEL, 450SL, 450SLC, 6.9 and others. This unit has been tested and all functions do work including the odometer. Reads up to 125mph and odometer reads 40K miles. Unit is calibrated to W=1155…

But I am dubious about the claimed calibration as a lot of the models listed had different rear ratios. Does anybody know what calibrated to W=1155 means? I emailed the seller but so far no reply….

The difference in ratios is ~13.7% if I could improve my mpg that much I will be very happy! –That’s ~3.5mpg! I didn’t think the change was so drastic as other forum members have switched from 3.07 to the 2.47 ratio and been quite happy-that’s a 19.5% change!