Hi Craig,
A HV
oil pump is all you will need. I would also reccomend installing an
oil thermostat with your
oil cooler setup. The low temps down your could have the oil running too cold. The thermostat setup bypasses the cooler till the oil gets up to temp. It helps get the oil up to operating temp a bit quicker too.
My Aunt and Uncle lived in Invercargill for many years. They have since moved to Australia where it's a bit warmer for their retirement. They used to look after the light house at Puysegur Point
Puysegur Point Lighthouse
I've still got a couple of cousins down there.
Cheers