Thanks, I did that to my fintail. While it's a perfectly working solution I was never too happy about it, since it's mounted under-dash and is therefore not in the immediate line of sight when driving. Found some old threads about temp gauges and some suggested it could be as simple as a kink in the line, will check that first!

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Tomas, Sweden
1966 Mercedes Benz 230S with OM617.912, automatic. Disk brakes from W108
1983 Mercedes Benz 300TD grey, OM617.912 and 5-speed manual
1983 Mercedes Benz 300TD blue 7-seater, OM617.912 and 5-speed manual