Smiths Classic voltage stabiliser. Required for electrical fuel level, oil temperature and water temperature gauges which all require 10 volt feed. One stabiliser will work no more than three gauges at once.
Wiring for Stabiliser is 12 volt feed to the terminal marked as 'B'. The terminal marked I is for the 10 Volt out of the stabiliser to go the gauge. The stabiliser must be earthed separately and be mounted in the correct orientation.