TSBS For a 91

12. OTHER Bulletin Number: 476149
http://about.edmunds.com/maintenance/recalltsb.do?step=tsb&year=1991&make=Chevrolet&model=S-10+Blazer&style=2+Dr+Tahoe+4WD+Utility&zip=17961&synpartner=abo&tid=abo.g..mnt.step2.9.Chevrolet*



I ask about number 12. I searched google did not find anything anybody able to give more insight on good ol number12.

if you want to find some things like this about your rig
http://about.edmunds.com/maintenance/MaintenanceServlet

OIL PRESSURE GAUGE READING CONCERNS #47-61-49 - (Dec 8, 1994)

CONDITION:
SOME OWNERS MAY COMMENT ON ONE OR ALL OF THE FOLLOWING CONDITIONS:

* HIGH OIL PRESSURE WHEN STARTING ENGINE COLD. * LOW OIL PRESSURE WHEN ENGINE IS AT IDLE HOT. * ERRATIC GAUGE READINGS.

CAUSE:
OIL PRESSURE SENDING UNIT WAS NOT OPTIMALLY CALIBRATED FOR ALL OPERATING CONDITIONS.

CORRECTION:
IF ACTUAL OIL PRESSURES ARE WITHIN TOLERANCES LISTED IN SECTION 6A OF THE SERVICE MANUAL, AND GAUGE CIRCUIT ELECTRICAL DIAGNOSTICS IN SECTION 8C OF THE SERVICE MANUAL DO NOT UNCOVER THE SOURCE OF THE PROBLEM, A NEW OIL PRESSURE SENDING UNIT SHOULD BE INSTALLED.