You'd need a wiring diagram, but if you put a 12v feed to the instrument +ve feed, then earthed the connector for the temp sensor wire the gauge should go fully hot.
The Haynes manual has a wiring diagram for the mk1 instrument cluster I think.
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It never got fast enough for me
Hunter S Thompson
R.I.P. Peter David Scott 18.07.59 to 21.11.16
Will be missed by us all but we will always remember you.
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