If I am not mistaken you can't splice your water temp for both gauges, you will get a false reading. I ran into the same problem when I was putting in my gauges. I ended up having a dead water gauge on my dash because I didn't want to tap a new hole in my lower intake for both gauges to work. I didn't/don't know of a way to have both of them working. As far as the oil pressure, I just added a "T" fitting to my factory sending unit, and added on the Autometer sending unit. That way they were both getting their own oil supply. Just have to make sure you get a good fit with the fitting our it will leak oil. (found out the hard way they were not tight enough) Both of my gauges are electrical and haven't had a problem with them yet. Hope this helps you out.
Chris
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