Heater controls

The switch for the heater has four wires on it and because I dont have the panel that switch gos in I have made my own with carbon fibre, which of the two wires can I connect to a two pole switch to have the heater on full? If I had a multimeter it would be easy but I dont. Sorry to be cheeky but I want to make up an oil feed hose with aeroquip does anyone know what bits I need or the thread sizes for both the turbo end (2554r) and where it connects to the engine. -6? Cheers in advance chaps:)

there is one positive 'in' and 3 'outs' for the speed.. get a multimeter to determine which one is +12v at ignition on, then touch that wire onto the other 3, one at a time, to determine which one is the fastest speed. i did this on my old car as i had hi and low fan speeds on toggle switches :)