Mike,
I would suggest you get it back from Richfields and send it to Speedy Cables in Swansea, they are not always that quick on turn around but they do a good job, they rebuilt two of these gauges for me, one had exactly the same fault you mentioned which was down to me applying too much heat to test it, the other had one of the pipes damaged by my mechanic they came back like new.
If Richfields have not made the matter worse by attempting to repair it you should be ok.
Geoff.
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