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ECU / Guage coolant temp discrepancy


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my Caterham gauge is showing quite a big discrepancy compared to my emerald ECU.  It lags about 20c behind. I'm guessing the gauge and Ecu have different sensors in the water rail. Is there an easy test to determine if it's gauge or sensor at fault? I have cleaned all contacts  so I can rule that out. 

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Without sound like a stuck record, call Redline. They'll likely have them on the shelf and it'll be with you the next day, a little cheaper from Caterham as well I think. A few of us are after some temp senders, so they may run out shortly!

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