can any one tell me or show me a pic of the o2 main sensor on the 7a-fe cause i want to wire up a air fuel mix gauge but cant find the sensor thanks

Unless it's different on Euro cars, it's that metal thing sticking out when you look down at your exhaust manifold. Looks a little like a spark plug with a wire coming out of the end.

but if u connect it directly to the standard sensor, u'll never get an accurate reading, the figures will constantly jump from lean to rich, what u need is a wide band O2 sensor and gauge, if u have a narrow band gauge, that'll work with standard sensor, but like i said....messy readings...