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Lucas Gauge hardware

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I have an old Lucas gauge that used a knurled round nut on a threaded rod to hold it against the dash.

But the nut is gone and I need a replacement.

Any idea what size it is?

I believe it is an old Imperial size and not metric- I've got new Lucas gauges that have similar nuts of comparable size, but the thread is wrong. I presume it's because the new ones are metric.

What are the old ones?

British: 2BA? or some kind of machine screw 6-32?

Help!
 
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