B767-300 CREW HAD A TRACK DEV DEPARTING SFO ON THE SFO 8 SID.

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OUR CLRNC WAS THE SFO 8 SID WITH A HDG OF 030 DEGS. AFTER TKOF; I WENT TO TURN THE 20 DEGS R TO A 030 DEG HDG BUT NOTICED THAT ACCORDING TO THE EHSI'S WE WERE ALREADY ON A 030 DEG HDG AND APPROX TRACKING RWY 1R CTRLINE. I MENTIONED THE AMBIGUITY TO THE FO. AT ABOUT THIS POINT OF TIME WE WERE PASSING APPROX 2000 FT AND NORCAL DEP CALLED AND ASKED US TO FLY HDG 030 DEGS. I IMMEDIATELY TURNED ABOUT 20 DEGS R TO WHAT I THOUGHT TO BE ABOUT A 030 DEG HDG. AT THAT POINT I NOTICED THE WORD 'TRU' ON THE EHSI AND LOOKED TO SEE THE HDG REF SELECTOR SELECTED TO 'TRUE' INSTEAD OF THE NORMAL 'NORM.' I THEN SELECTED NORM AND THE EHSI SLEWED 20 DEGS BACK TO THE L WHERE IT SHOULD BE. THE FLT PROCEEDED NORMALLY. FACTORS LEADING TO THE EVENT WERE THE FACT THAT THE AIRPLANE HAD BEEN IN MAINT FOR 3 DAYS AND SOMEONE OBVIOUSLY SELECTED TRUE AND I FAILED TO NOTICE IT ON MY PREFLT DUTIES. THIS IS A SELECTOR THAT; IN MY NEARLY 2 DECADES AT ACR; I HAVE NEVER NOTICED TO BE OUT OF THE NORM POS. WE ALSO FAILED TO NOTICE THE MISALIGNMENT OF THE RWY ON THE MAP DURING RWY LINE-UP. COMPLACENCY ALSO PLAYED A ROLE. SUPPLEMENTAL INFO FROM ACN 633704: ON PREDEP I NOTICED THAT THE PLANE HAD NOT BEEN FLOWN IN 3 DAYS DUE TO MAINT WORK. I TOLD THE CAPT THAT WE SHOULD 'WATCH OUT FOR SWITCHES' IN THE WRONG PLACE. I ALSO NOTICED THAT THE ACFT SYMBOL WAS ALIGNED WITH RWY 1 BUT OUR HDG WAS ABOUT 14 DEGS OFF. I MADE A MENTAL NOTE TO CHK IT ON TAXI AFTER FULL INS ALIGNMENT BUT FORGOT. THE CAPT DID THE TKOF AND I CLRED HIM RIGHT FOR THE TURN TO 030 DEGS ON THE SFO 8 DEP. HE TURNED A LITTLE AND THEN I STARTED TO WATCH THE B777 IN FRONT OF US AFTER CLEANING UP THE ACFT. I LOOKED DOWN AND SAW WE WERE NOT ON THE LNAV LINE BUT WERE HDG 030 DEGS. I THEN CHKED THE STANDBY COMPASS AND SAW IT AT 010 DEGS. THE CAPT THEN SAID 'WE ARE PARALLELING THE RWY CTRLINE?' I TOLD HIM TO TURN R JUST AS NORCAL ASKED US IF WE WERE HDG 030 DEGS. I TOLD THEM WE WERE HAVING A PROB BUT DID NOT DECLARE ANYTHING. THE CAPT TURNED TO 050 DEGS ON OUR HDG INDICATOR AND THEN SAW THE MAGNETIC/TRUE HDG SWITCH WAS IN THE TRUE POS. AFTER PLACING THE SWITCH IN THE MAGNETIC HDG; THE HDGS CORRECTED BACK TO 030 DEGS. NORCAL THEN CLRED US DIRECT LIN. WE LOST SOME SEPARATION FROM THE B777 BUT NOT MUCH AND I HAD HIM IN VISUAL CONTACT THE ENTIRE TIME. THE WX WAS SEVERE CLR. GOOD LESSON ON CHKING THE RWY HDG WITH HSI BEFORE YOU TAKE OFF. MISSED IT THIS TIME!