You need to find a tee adapter that has:
BSPT (F) (original oil
pr sw)
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------------- NPT 1/8" (F) (New oil press sensor)
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BSPT (M) (To cyl head)
Then the BSPT male goes into the cylinder head (where your oil pressure switch is now), stock oil pressure sw goes into the BSPT female, and your new oil press sending unit goes into the NPT fitting.
Look on SummitRacing.com for these fittings. I think they're there.
As far as the coolant temp...you need to find out what the gauge expects as far as the resistance range. If this ranges matches the CTS in you car, then you can make it work. Do you have the detailed info on the gauge?
Steve