I just went with the stabiliser/regulator thingy that was on the back of one of the GT6 speedos i bought as after some reading all they do is efficitevely take the volts from 12 to 10. (well... it's not that simple, but that'll do)
In case it's of any use, the same stabiliser unit was also on the back of a Herald speedo i bought! yup, i tried a lot of speedos
Even without that in place both my fuel gauge and temp gauge were working, they were just over reading.
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