I have a 85 300SD and I am wondering where the dash cluster gets ground. I posted a thread on here a few weeks ago about my fuel, oil pressure and temp all reading at there maximum reading. 85 300SD fuel,temp, and pressure guages not working!!

Today I went to the local pick and pull and bought a complete guage cluster and the board that it attaches to. It is still doing the same thing. I know I have a short somewhere or possibly not getting enough ground. There are four metal tabs that attach to the dash where the cluster seats into it...i dont see how the cluster would be able to recieve ground from these tabs. I tried wiggling the cluster to see if it was a simple contact and still nothing. I have checked the fuses and they are all fine. What should I do next?
-Stephen

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68 250s SOLD
78 300d non turbo SOLD
1980 240d manual SOLD
1981 300SD 360,000 miles I think she's doomed for a parts car but has a good engine SOLD the engine to spamman
1977 300d non turbo SOLD
1985 300SD california car
1978 240D Manual