
The first lid I converted, although the speedo has an external water jacket I wanted to experiment with a cooling coil inside so the water would recycle both inside and out + the Triclover added where the hole is (when welding the lid suffered a little flex) still usable but didn't hold too much pressure. The 2nd lid I just fitted a triclover.
Currently sitting unused in a BFO stainless freezer unit.
So my only advice would be not to weld anything to the lid only use screw fittings.