Strange Problem with the Speedometer.

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I just bought a month ago an Infiniti G20 1993. I just changed the Timing chain, Compressor and P/S Belt, Fuel Filter and Oil filter.

After that I have the same problem as others the Brake, Battery and Antilock Lights coming out. Also when the engine start from cold the revolution goes up an down, If I dont push the accelerator it stop the engine. Reading some old post The problem maybe its from the Alternator. I will check that later.

Also the Speedometer with the Mile count Its not working There is a possibility that some fuse its broken Or Relay. Somebody can tell me where is it.

Thanks in advance for your help

Armando