A PVT PLT IN A TB10 EXPERIENCES AN ALTDEV DURING AN EMER SIT WHEN HIS FUEL PRESSURE GAUGE IS REGISTERING IN THE RED.

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I WAS ON A FLT TO SANTA BARBARA UNDER IFR CTL. AFTER REACHING CRUISE ALT OF 6000 FT MSL; I NOTICED THE FUEL PRESSURE INDICATOR HAD DROPPED TO THE BOTTOM OF THE RED. I TRIED SWITCHING TANKS ON MY TB10; BUT THAT HAD NO EFFECT. I TURNED ON THE AUX FUEL PUMP AND THAT LIFTED THE PRESSURE INDICATOR TO THE VERY BOTTOM OF THE GREEN -- STILL INDICATING MINIMAL FUEL PRESSURE. THE ENG APPEARED TO BE RUNNING SMOOTHLY; HOWEVER. AFTER TURNING THE BACK-UP FUEL PUMP OFF; THE INDICATOR AGAIN FELL TO THE BOTTOM OF THE RED. I INFORMED ATC THAT I WAS HAVING A PROB WITH THE FUEL PRESSURE AND WAS ASKED IF I WANTED TO DECLARE AN EMER. I DECLARED AN EMER AND TOLD ATC I'D LIKE TO LAND AT OXNARD ARPT WHICH WAS PRACTICALLY BELOW ME. I WAS TOLD I'D BE GIVEN VECTORS TO THE LOC FOR THE APCH INTO OXNARD. DURING THIS TIME; I NEEDED TO GIVE A SAFETY BRIEFING TO MY 2 PAX AND GO THROUGH MY EMER LNDG CHKLIST. I NOTICED THAT; AT ONE POINT I WAS ABOUT 300 FT ABOVE MY ASSIGNED 6000 FT ALT; BUT ATC DID NOT MENTION THIS. ON THE APCH; ATC DID MENTION AT ONE POINT THAT I APPEARED TO BE S OF COURSE; I BELIEVE; AND ASKED IF I WAS CORRECTING. I TOLD THEM I WAS. I WAS NOT ASKED UPON LNDG TO FILL OUT ANY FORMS OR CONTACT ANYONE. THE LCL SECURITY OFFICER CAME BY. I ASKED IF I NEEDED TO FILL OUT ANYTHING; HE SAID NO. MY ALT AND COURSE DEVS WERE; OF COURSE. UNINTENTIONAL; BROUGHT ABOUT I'M SURE BY THE DISTR OF DEALING WITH MY INFLT EMER. CORRECTIONS WERE MADE RIGHT AWAY. THERE WAS PLENTY OF FUEL ONBOARD -- ABOUT 5 HRS WORTH. I HAD THE PLANE TOPPED OFF PRIOR TO THE FLT -- I WAS ONLY AIRBORNE ABOUT 35 MINS WHEN THE FUEL PRESSURE INDICATOR DROPPED INTO THE RED ZONE.