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Is the clarion convertor still there? I'm pretty sure that the speedo is 24v but the temp and oil are both 12v as is the clock. If you can find them there should be a couple of light blue wires one does the oil and temp gauges and the other is for the clock, there should also be a 24v feed that used to go to the convertor also. Not sure how much help there is but I can probably offer more advice if you need it I've had the dash and stuff apart on my safari quite a lot of times and messed around with it