I'm pretty well finished with my Wolseley Viper engine, with only some detail painting and the application of a grimy wash to go. I added plugs from 0.5 mm brass tubing (16 in total) and plug wires made from 0.10" lead wire. This is the first time I've used lead wire for plug leads and I found it more flexible than copper wire, holds its shape better, and overall, it's just much easier to work with. Luckily, it fit right into the 0.5 mm tubing too.

I replaced the plastic plug lead tube on top of the magnetos with a length of 1.2 mm brass tube. I fed the plug leads into each end and super glued them in place. Although you can't see it in the photos here, I added some very short wires from the tube to the magnetos. The water pipes to the cylinder heads is made from household solder.

That's all I plan to add to the Viper as I'm told by two members here that there are some major fit issues when installing the engine in the fuselage, so if I have to use a pair of side cutters to prune off parts to make it fit, I can't see the point in adding any other detail.
Cheers,
Chris