It will almost certainly be behind the instrument binnacle since it feeds both water temperature and fuel gauges. Widely used on British cars that used bimetallic gauges, which are characterised by a slow response time from the time that the ignition is turned on. Think Morris Minor. Used to be cheaper than chips. Difficult to test other than by substitution.
Earlier Bristols (to my knowledge up to the 410) used a balanced magnetic petrol gauge which didn’t require a constant voltage. The latter gave an instant response but jiggled about a bit if one hurled the car about and was considered upmarket in its day.
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