since the po had the oil injection disabled, i'd run premix. i would definately have a water pressure guage. it also should have a temp sensor. i would run both. i like the pressure guage because it lets me know a problem is developing. with a new water pump, you should have between 10 to 13 psi @ 4000 rpm. when mine starts only showing 7 to 8, i know i need to change it soon.
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