B737-300 ACFT TURNING IN FOR FINAL APCH OVERSHOT CTRLINE OF ASSIGNED RWY AND ENCROACHED ON PARALLEL RWY APCH PATH.

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I WAS ON MY IOE FOR B737-300; OAK-LAX ON APR/XA/98. WE WERE ON A R DOWNWIND TO THE RWY 24 COMPLEX WHEN APCH CLRED US FOR A VISUAL APCH TO FOLLOW A B757 ON FINAL. WE HAD A GOOD VISUAL ON THE B757; BUT I COULDN'T SEE THE ARPT ENVIRONMENT (LIGHTS; DUSK; UNFAMILIARITY; ETC). WE DIALED IN THE LOC AS BACKUP; AND I PROCEEDED TO FOLLOW THE B757. ON DOGLEG; I LOOKED TO BE APCHING THE 6 O'CLOCK POS OF THE B757; SO I STARTED TO TURN DIRECTLY TO FINAL. I THEN NOTICED TO LOC WAS APCHING FULL DEFLECTION; SO I TURNED TO CORRECT BACK TO THE R (I BELIEVE WE WERE CLRED RWY 24L). THE APCH CTLR CAME UP AT THAT TIME TO TELL US HE HAD AN ACFT ON APCH ON THE RWY 25 COMPLEX; AND WE NEEDED TO COME R. WE TOLD HIM WE WERE IN THE TURN. WE SAW THE ARPT AT THAT TIME ALSO; AND NOTED WE WERE BTWN THE 2 COMPLEXES; THOUGH MUCH CLOSER TO THE RWY 24 COMPLEX (WHERE WE WERE SUPPOSED TO BE). THE CTLR NEVER SOUNDED URGENT; AND WE DON'T THINK WE GOT CLOSE TO THE OTHER APCH ZONE; BUT WE FELT UNCOMFORTABLE THAT BY FOLLOWING PROPER VISUAL APCH PROCS (IE; FOLLOWING THE PRECEDING ACFT); AND NOT BEING THAT FAR OFF RWY ALIGNMENT; WE CAME TO A POINT WHERE THE CTLR FELT HE NEEDED TO TALK TO US. THERE ARE NO NOTES IN THE COMMERCIAL CHARTS TO STAY TO ONE SIDE OF THE LOC BEAM SUCH AS IN SFO. POSSIBLE SOLUTIONS: 1) ADVISE AHEAD OF TIME OF TFC ON THE OTHER RWY. 2) DON'T CLR ACFT FOR VISUAL APCHS TO CLOSE PARALLEL RWYS. 3) MAKE A CHARTED VISUAL PROC WITH THE APPROPRIATE NOTES.