Just bought this nice old ride last week. Speedo, fuel tack and oil pressure went south at the same time. Checked fuse box, nada. Car runs great, just how fast/far? Help please. George

First thing I would check is to pull the gauge cluster out and check that all wires are secure. Possible one or more may have disconnected. If you are not sure how, cut two 10 inch wires from old wire clothes hangers. Keep the wires straight but creat a small hook at the end of each. On each side of the cluster slip the hooked end of the wire in about two inches up from the bottom of the cluster. Careful here not to tear the dash. Keep the hooked end turned toward the gauges. Gently tug left,right,left,right. Until the cluster is free. Hope this helps.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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I would suspect a ground problem.

I had the same thing on my 420.

Pull the cluster, disconnect the wires so you can remove it completely. (no need to remove steering wheel- just adjust all the way out) Back there somewhere toward the middle there is a bolt or a screw with about 3 or 4 ground wires connected to it. Remove the bolt, sand all terminals as well as metal piece that bolt screws into- coat everything well with a thin coat of dielectric grease and reassemble- that should fix it things.

BTW I had exactly the same symptoms, only the speedo still worked.

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2000 ML430 86k
2000 C280 Sportline 100k
'86 420 SEL 178k
'91 Audi 100 179k
'88 BMW 750il 167k
'83 300 SD 167k (sold)
'79 300 D 78k (sold)

Thanks for the help!

Had a look behind the guages and found nothing wrong.........pondered ......had another look at the fuse box and just for fun, changed the number six fuse out to a new one.......Guages Working...like magic! Thanks for the help. George
Next, Radio needs help and a new antenna. G.

Biggeorge said: had another look at the fuse box and just for fun, changed the number six fuse out to a new one.......Guages Working...like magic!
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Now do yourself a favor and change ALL the fuses in the box. As you found out those old fuses can fool you.

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1986 560 SEL (159K miles)