Dash board light not working gas gauge working . speed diameter not working on 20005 350 ml Mereceds Benez

What make , model an year vehicle ?

Do you have power on all of the fuses in the passenger compartment and the box near the battery ?

It would appear that a multiplug has not been fitted correctly.
I would get garage to scan diagnostics to verify.

You don't say what the make model and year is, but generally the gauges get power from the same place the gas gauge does. Each gauge is grounded thru a sending unit or switch.
So my guess would be a problem inside the instrument cluster.

GAUGES NOT WORKING

If all voltages checked ok, then most probably its faulty instrument cluster board on which gauges are connected. Yes if cluster circuit board looks ok, then also it can be faulty. Somewhere there is minute short or burn on board then such problem arises.

Also check the fuse box. One under hood and other under dash.

Inspect each and every fuse and see if all are fine or not.

Click the link below for complete step by step troubleshooting:----

http://alltypesofpartsreplacing.blogspot.com/2012/12/no-spark-faulty-spark-plugs-replace.html

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Thanks.

Try to tightin up the light bulb. be aware the only way to do this is to remove the hole dash. if you do not know how to do this i would recamend you take it to a shop are ask me to go through step by step directions.

You need to check your main fuses under the hood first and then check them under the driver side dash board.

look up TIPM or IPM which connects to your left SCM that had an electrical overload due to your aftermarket tow wiring harness

Smack the left side of the dash and see if it comes on. This is a common problem. The circuit board in the cluster is cracked. You can buy another one at the dealer but it isn't real cheap. About 300. Plus after you install it the dealer will need to calibrate it before the speedo will work.

On thedash of my 2003 sedan sebring ,My dash ilumination lights for the speed,temp,tack\rpm and fuel are unlit.
I found that there is a paper thin plastic across and behind all four of these gauges which lights up all four gauges,if working correctly, There is a very poor connection to this thin film lighting system ,basicaly a wire terminal used as a staple and that very well could be your problem.
It as far as I know would require whole gauge assembly replacement! because dealers dont sell such small portions of some assemblies!
I myself will attempt to crimp this poor connection on my car without damaging thin film! there are no bulbs for those four gauges too iluminate!