Where the mileage odometer is, I had a "clock" icon with a wrench and the number "10" pop up, ...what does this mean ???? (2003 SLK320 )

You never know,but most of the time the reading on the odometer will stay with the dash you are installing,your old dash reading will not show on the new dash odometer.

It stands for odometer

It means your car needs to be serviced. You are probably at a recommended mileage service.

I hope this helps.

This means that your vehicle requires service. Something is wrong. You can take it to Autozone and they will put it on their diagnostic machine for free. And tell you what is wrong. Usually nothing major. Just needs to be checked out.
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This is a mileage interval light that trips every 3,000 to 5,000 miles that indicates an oil change is necessary. You do not need a special tool to change your oil, nor do you need to bring the car in to the dealer.
1. Sit in the driver's seat of the Passat and close all the doors.
2. Position the trip/odometer button to display the odometer mileage reading, then hold it down with the forefinger on your left hand.
3. Turn the ignition key to the "key-on/engine-off" position to turn on all the power options for the Passat without actually starting the engine. At this point, a service indicator light will display (in the form of a wrench).
4. Press the minute adjustment button on the clock (or turn the knob clockwise on European manufactured Passats) and release the trip/odometer button.
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The wrench warning lamp, usually means trhat it is time to service the car, it is activated by the odometer, when it rteaches the service interval mileage from the last time it was set.

reset: turn ignition on...push odometer button till it displays mileage on car...not trip milage but actual mileage. Turn car off. Open driver's door, press and hold odometer button....turn ignition to on....hold odometer button for 10 seconds....odometer display will show -----,----,---,--,-,0000000....maintenance lights are reset...lights will come on every 7500 miles to remind you to change oil and check fluids etec....

The negative number means the car should have had it's oil changed that many miles ago. Oil life starts at 100% for new oil & counts down every 10%. At 15% the display will always show, which means it's near time to change the oil.

usersteve83, your oil may have been changed but the timer not reset. Reset the timer as shown...
1. Turn ignition to the "ON" position. (do not start engine)
2. Press SEL/RESET repeatedly until the oil life indicator is displayed.
3. Press & hold the SEL/RESET for about 10 seconds until it blinks then let go of the button.
4. Press the SEL/RESET again for about 5 seconds or until the oil life indicator resets to 100%.

Wrench = Maintenance Minder: Symbol letter & number...
Symbol A - Relace engine oil.
Symbol B - Replace engine oil & filter, Inspect front & rear brakes, Check parking brake adjustment, Visually inpest the tie rods, suspension components,driveshaft boots, brake hoses & line (including ABS), all fluid levels & their conditions, exhaust system, fuel lines & connections.
Symbol 1 - Rotate tires.
Symbol 2 - Replace air cleaner element (dusty conditions every 15K miles) & replace dust & pollen filter (behind glovebox) every 15K miles if mainly dusty or city driving.
Symbol 3 - Replace transmission fluid.
Symbol 4 - Replace spark plugs.
Symbol 5 - Replace engine coolant.

All above are taken from the 2006 Civic EX owner's manual.