any thoughts about the following problem on my 1988 w124 300ce: not only is the oil pressure gauge dead , but so is the fuel level gauge! Both were suddenly dead when my son started the car; and he heard a ringing noise coming from the dash. Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)