To address the rest of your comment - the term "head gone" is a loose one. A head may be bent from heat or it may be cracked. A bent head will be indistinguishable from a leaking head gasket - you will get immediate mayo. A cracked head be dfferent. Cracks develope in a head over a long...

Good that you sorted. I run 2 110 tdi's (actually 3 - I bought another yesterday) and they don't do the same thing with the heat gauge. Both original heat gauges been slung out and replaced with accessory types. Car A hardly ever moves from 89 degC. Only on the steepest hill hauling a big...

Firstly, Landie heat gauges are virtually useless. Get a proper one from a spares shop that uses the same wiring and probe thread 3/8 NPF. Now you will get a realistic indication of cylinder head temp. Secondly, you should see only very small varations in temperature, normally a slight rise on...