carlosbeldia Posted June 25, 2014 Share Posted June 25, 2014 It came that way. We bought 2 units and both came that way. There is a thread in the hole and I can see in Google some of these units came originally with an Allen bolt in that space.. Quote Link to comment Share on other sites More sharing options...
secondjeremy Posted June 25, 2014 Share Posted June 25, 2014 Some vehicles have a vacuum switch fitted there. Idea is that when there's sufficient vacuum the switch is open - light out. No vacuum - light on. Rover fitted them for a while - then deleted them from about 1980. Quote Link to comment Share on other sites More sharing options...
carlosbeldia Posted June 25, 2014 Author Share Posted June 25, 2014 O, perfect, thanks a lot Quote Link to comment Share on other sites More sharing options...
steve b Posted June 25, 2014 Share Posted June 25, 2014 Pretty sure its 1/8" bsp thread Carlos cheers Steveb Quote Link to comment Share on other sites More sharing options...
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