C310 PLT ON ILS APCH TO SBA LWOC FROM TWR.

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ENRTE TO SBA VFR; SBA WENT IFR DUE TO COASTAL STRATUS. I HAD BEEN TALKING TO SANTA BARBARA APCH AND ASKED FOR THE ILS. I WAS VECTORED FOR A BIT THEN CLRED FOR THE ILS 8 MAINTAIN 2000 FT TILL ESTABLISHED. I NEVER HEARD OR NEVER RECEIVED A 'CONTACT TWR' INSTRUCTION; AND SOMEHOW IN MY CONCENTRATION ON FLYING THE NEEDLES; DID NOT QUESTION THIS OR CONTACT TWR. I REALIZED THIS AFTER I CONTACTED GND UPON EXITING THE RWY AND GND ASKED WHY I HADN'T COMPLIED WITH A TWR INSTRUCTION REGARDING EXIT. THAT'S WHEN I REALIZED I HAD FAILED TO CONTACT TWR. (THIS IS THE STUFF OF BAD DREAMS!) CHAIN OF EVENTS: PROB AROSE WHEN EITHER 1) APCH FAILED TO INSTRUCT ME TO CONTACT TWR; OR 2) I MISSED THE INSTRUCTION (I CERTAINLY DID NOT READ BACK SUCH AN INSTRUCTION) AND 3) I FAILED TO TAKE THE INITIATIVE TO EITHER QUESTION APCH OR CONTACT TWR WITHOUT INSTRUCTION. DISCOVERED BY: PLT (ME) AFTER LNDG. CORRECTIVE ACTION: NONE -- COM ERROR DISCOVERED AFTER THE EVENT. HUMAN PERFORMANCE CONSIDERATIONS: PERCEPTION: CONCENTRATING ON ILS NEEDLES. FORGOT TO MAINTAIN COMS DISCIPLINE. JUDGEMENTS; DECISIONS: THE PROB WAS THAT THERE WERE NO JUDGEMENTS OR DECISIONS IN EFFECT. ACTIONS/INACTIONS: THOUGH AS PIC I BELIEVE I WAS ENTIRELY AT FAULT; IT MIGHT BE THOUGHT THAT THE TWR WOULD HAVE BEEN CONCERNED THAT AN AIRPLANE ON LONG FINAL WASN'T COMMUNICATING AND CHKED BACK WITH APCH WHICH COULD HAVE TOLD ME TO CONTACT TWR. NOT AN 'ACCEPTABLE' SIT; ONLY THAT IT WOULD BE CORRECTIVE. FACTORS AFFECTING QUALITY OF HUMAN PERFORMANCE: HAPPY WITH SPOT-ON GS AND LOC; I DIDN'T EVEN THINK ABOUT TWR. THIS WAS A FORM OF FIXATION; LIKE STARRING AT ONLY 1 INST INSTEAD OF SCANNING; BUT INSTEAD MY SCAN WAS FINE; I JUST FORGOT TO DO THE REST OF THE JOB. LESSON LEARNED: CONTACT TWR ON FINAL! PHILOSOPHICALLY: THIS WAS SIMPLE HUMAN ERROR. BUT ANY ERROR IN PROC IS ALWAYS A WAKE-UP CALL TO BE EVER MORE ALERT AND FOCUSED.