I have a Squier Vintage Modified Jaguar P/J Bass. Its the model that has the 2 concentric pots in it. I recently up graded to SD QPs. Question is the I purchased the P-Pickup separately from the J-Pickup and not in a matching set.Would the stock wiring work or do I have to reverse the + and - wires on the J-Pickup to eliminate hum? Thank you for any feedback on this.