I just finished a V6 to V8 swap ant got the car started today. But my tach isn't working. The tach is from a V8 car. If anyone has a picture of the tach wire maybe that would help but I think I have the right one(brown plug). And the oil pressure guage in the tach isn't working either.

Any thoughts on what i did wrong or details i may have missed?

This is my first car and im pretty anxious to get it on the road.

Thanks