Qveon

#1: Oil pressure gauge, How do i hook one up?
#2: Speedometer recalibration, i got low profile tires and the speedometer doesn't read correctly, how do i fix?
#3: Is it worth it to buy all new Best grade Spark plugs, wires? What about a new coil too?

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BoostedH24

#1 not sure i think you make a T connection from the stock oil pressure sensor
#2 (IMO)don't bother just know how far it is off
#3 no, no don't do it unless your spraying or FI but if you do it anywa get NGKs or Denso's no german stuff or american stuff

Absolut

Under the oil filter is a fitting into the block with 1 wire comming out of it. Use a brass T on the fitting that goes into the block, screw the oil pressure sensor (the 1 wire thing that was in the hole) into one side, and your gauge sender into the other side.
Now your gauge will work, and so will the dummy light on the dash.

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Jason