I have an intermittent fault with the dash gauges and turn indicators on my 1977 W123 250 (Compact). The gauges and turn indicators will stop working, then after a few minutes will start working again. However, the hazard flashers work okay when this problem appears. I don't think it would be fuse related, as I believe a fuse either is intact or it is broken. Does anyone have any ideas what the cause could be?

TIA

Stanley Bell (Melbourne, Australia)