The alloy ones have two threaded poles booth the same size with plugs in them. I have fitted the capillary tube into an adaptor in the front hole . The alloy ones usually corrode out at the back but can be welded up . I found with mine the thread had corroded so I used a tapered thread adaptor that would take the capillary tube into the housing which because it was tapered could be tightened in the hole & sealed really well, so no leaks. I mounted the gauge in the steering column hole for LHD as I didn't want to drill any holes on the drivers side & on a 80" there isn't many places you can mount it . Good luck with it.
Wayne



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