Oil pressure gauge

:
Mazdaspeed3
maybe a stupid question...

i bought a bunch of gauges for 100 bucks from some kid in aneighboring town a while back. they were cheap and in good condition but i mainly bough tthem for the boost alone. since then i got an accessport but still have the gauges mounted in the dash. because i cant uncut my dash im keeping the gauges. well, i need to hook up the oil pressure gauge and dont know exactly what i need besides the gauge. i have the oil conversion kit to rid the factory cartridge filter. it came with the prosport sandwich plate to hook such things like this oil pressure gauge up. i know in other vehicles you need a new oil sender unit but with the sandwich plate can i just buy a line and run the line to the gauge? im not sure how abouts to do this and was looking for some direction on what i need and what i need to do.

thanks.
 

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