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Old 30th June 2020, 08:47
TimS TimS is offline  
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Join Date: May 2020
Location: Crewe
Posts: 3
Hi, we have a '66 TK that has suffered a similar problem, but neither gauge worked at all. We tracked that down to the incorrect wiring of the common power lead in the speedo cluster, but now the temp reads just above 'C' and the fuel reads full all the time. We've sourced a temperature sender that we're going to fit, but can't find a fuel sender unit, so might look at getting it repaired.
Your later model will have a very similar speedo cluster, but a printed circuit board instead of the simple wire-to-gauge setup that ours has. I'd have a look there first, making sure that all connections are good and clean and the circuit board is intact. There are a few speedo clusters on eBay, but they're a bit pricey.
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