The old "economy" gauges were little more than an engine vacuum gauge. The assumption was that if you didn't put your foot into the throttle you'd get better economy. Engine vacuum is maximum at an idle or coasting in gear down a hill. The goal of the vacuum gauge was to help you maintain as much engine vacuum as possible, in the hopes that you'd get better economy that way.
On the gauge cluster it should be the left knob. Just turn it.
When and if you buy a fuel economy gauge. Follow instructions provided.
The normal operating temp for any Mercedes is between 80°C and 100°C (the next line after 80°) Anything over 100° and you should have it checked out. Mercedes are different, in that, the temp gauge is constantly moving because it provides true engine temp data... not just (normal) or stuck in the middle of the gauge.
yes
Diana
Needle in gauge should be midway between the 80 mark and the mark just above it.
the line on top of 80 is normal any higher its running hotter then normal
B/W 1-2 on the gauge
There isn´t a one (W168). The car only has a temperature warning light.
I'm guessing that your seeing those letters in the instrument cluster? VDO is a gauge company, thatsupplies Mercedes Benz with some of there gauges, ie. tach, speedometer.
30 degrees on dwell or 16 thousands with feeler gauge (close)
12 gauge