oil pressure indicator

[silvaleonardo]

received_10153886628681298.jpgHello....everything seems to be working fine all sensors detected but the oil pressure, I'm getting the red cross, the connection is very simple, 2 wires, one is sensor and the other is 12 v. The Dynon manual could be confusing about where to put the red wire, having the pressure sensor in front of you right or left? tried both and still not working.

[kmach]

If I remember right, the 12v wire required a resistor in it. Does it need a ground ?
The best solution would come from Dynon, I give them a call when I have difficulties