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Maybe look into a digital gauge.. like an ultra gauge.
I had one in my bmw e91 (same issue, no temp read out!) and it was great.. trick is to buy some colour film which you cut and slide over the screen to tint it to whatever colour your dash is. the bmw was orange and I think it matched pretty well.
I've one here for the T6 but I haven't found a good spot to mount it yet! but it works and gives you a lot of read outs (boost, voltage, coolant temp etc.)