oil pump

I have an 89 fj62 with about 220k. Used it as my daily driver for around a year and now the oil pressure reads zero and I get that scary clackity clack- I'm assuming it's my oil pump that has gone so I want to know best options for replacing it as I heard it's a pretty penny. Haven't started...

I am getting ready to replace my oil pan gasket and was wondering if I should or can replace the oil pump when the oil pan is off. Can this be done? Steve