thanks for your quick response.
tachometer does not work.
before it stopped it used to come on when i pressed the air conditioning buttons.
there is no amplifier under the hood,
there are no relays on the right passenger footwell since this is not a california car.
i checked the two relays under the hood controlling the aux.fan and the compressor and they are o.k.
would appreciate a diagnosis.are there any other relays that i am not finding????