I'm looking at two possibilites for venting - first is it would seem quite a few caps come with vents - although it is difficult to work out which do based on a lot of the manufacturers descriptions. On my tank I have added a new level sender over at one side of the tank. I silver soldered bolts into new holes to bolt it on, so I can use the old hole with a blanking plate for a dedicated vent valve if required. Alternatively the tank silver solders very well so you could solder a threaded boss into the top of the tank for a dedicated vent valve. You will only need a normal blowtorch to do this.
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