new oil sending unit, cant fine a gauge?

I just bought a set of three for my 69 dart with an under dash pod for all three. I have been happy with them so far I bought the oil pressure,water temp and tach. I added another port on the intake so my water tem stock gauge still works. These are easy to install they daisy chain the wiring so once the first gauge is set you just daisy chain to the next one.

http://www.glowshiftdirect.com/elite-10-color-gauges.aspx