Fitting your oil temp guage is a little more tricky.
You have a choice of fitting it in an oil line, this will give you the temp of the oil delivered to bearings or you can drill the sump plug or sump and sense the temp of the sump oil. The sump temp should be a little cooler but not enough to stress over.
If you water temp sender doesn't fit in the small sender hole it may fit the hole to the left which is usually used by the airconditioner to sense water temp. That gives you 2 options.
On the oil pressure front I'd use a "T" piece and instal your gauge AND and an idiot light (I have one) and even a buzzer so you know without looking when you've run out of oil pressure climbing at some impossible angle.