Think you've hit the nail on the head on both fronts - thermostat is probably the first order of business, assuming the cluster is reporting the temperature accurately (measuring values should tell you)
When was the cambelt last done as it's usually changed at the same time - not sure on the V8s if it's accessible without removing the belt? Think by some good fortune it might be....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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