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It's very random, sometimes it flickers while driving, sometimes it's off and sometimes it's on solid, this was before I hooked a wire to anything, nothing changed when I plugged it in.
The "dummy light" OPS is normally a 1-wire spring loaded floating ball receiving +volts from the - side of the warning lamp. The spring pushes the ball against the seat, which is grounded through the block, and completes the circuit (the bulb lights up). When there is enough oil pressure to compress the spring, the ball loses electrical contact with the seat and the circuit is broken (the bulb goes out).
If the OPS was the one that was unplugged, the bulb flickering would have meant that it was grounding out somewhere (providing the ECU isn't involved on your vehicle).
Does your Oil lamp come on before the engine is started? How about when the engine stalls?