1. My ZE doesent have an oil cooler, or possibility of one without modification. I dont think any of them came with one stock
2. Im not sure, But ill have an educated guess. First you WILL need a GZE loom and ecu to run the engine, i guess that being a similar motor originally, that most of the dash will still work as long as u wire it up correctly.
3. Follow it from the dash out the firewall if you have to.