major electrical problem ref speedo
 

can anyone help?
my 87 2.5 lux 944 suffers a problem - every now and again while i'm driving all ( everyone) the needles on the dashboard fail / die and the speedo stops clocking up miles - the sunroof doesn't operate as well. I don't know what to do!

i thought it may be the immobiliser malfunctioning however the car continues to drive normally without a problem -
has anyone experienced this before?
are the dash and sunroof linked in any way?

please help!
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