Teztez

I just bought a 1988 es347. Have a look at this model from the late 70s early 80s -and you’ll see it’s very similar.. your 335 is prob the precursor to the es347. And the coil tap switch is technically a coil split switch for the humbuckers (on/off with 2 pos). If you look hard at vintage hifi website you can find a schematic for the es347 which will be the same for your guitar. As simple as it looks it’s gonna be pretty hard to find a 1/2 inch width thread like the gibson 3pos selector switch in 2pos, my 1988 es347 uses a black dpdt mini toggle instead.