Warning flashing system

Hello all together, My warning flashing system does not work properly, only if I press against the switch direction windshield it works. As soon as I release the switch the flashing system is off again. For this I want to remove the warning flashing switch to see what does not work there. 1.Test failed – the storage of the speedometer indicator also removed the frame around the ashtray and blower turning switch. Question : Do I need for example the complete disguise abs Chrauben ? Is there perhaps easier way to get to it? Twingo 1,2 16V Built 2003 Would you like to read your suggestions. in advance THANK YOU