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Whats going on whit my 94 cobra to get desperate

hey hello to All the people I have a problem whit my car I attempt to put and new stereo on it all was good so out of the blue my light went out that one from inside my alarm doesn',t work no more my speedometer is frozen and the lil bell inside that ones point to that the key is in the SWITCH and I dunno what to do about it I check my fuses all of them and they',re good one thing the relays I don�t have idea how to check them so help me I can not move my car like that and I need it for work