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Calibration Test Adjust tire pressure to standard value. Using a calibrated, reliable speedometer tester, compare reading of vehicle speedometer to speedometer tester. See SPEEDOMETER ALLOWABLE VARIATION table. Replace speedometer if necessary. SPEEDOMETER ALLOWABLE VARIATION TABLE MPH (km/h) Allowable Variation MPH (km/h) 20 (32) .......................... 19-22 (31-35) 40 (64) .......................... 38-44 (61-71) 60 (97) ......................... 57-66 (92-106) 80 (129) ....................... 76-88 (122-142) 100 (161) ..................... 94-110 (151-177) TACHOMETER NOTE: DO NOT reverse polarity when installing tachometer, as diode and transistor may be damaged. Calibration Test Connect a calibrated, reliable tach-dwell meter to vehicle ignition system. Operate engine at various speeds (RPM). See TACHOMETER ALLOWABLE VARIATION table. If comparison between tach-dwell meter and vehicle tachometer readings do not fall in the standard range of permissible variation, replace vehicle tachometer. TACHOMETER ALLOWABLE VARIATION TABLE Engine Speed (RPM) Allowable Variation (RPM) 1000 .................................. 900-1100 3000 ................................. 2850-3150 5000 ................................. 4750-5250 6000 ................................. 5700-6300 TEMPERATURE GAUGE CAUTION: DO NOT connect sender wire directly to ground during test. Circuit Test Disconnect temperature sender wire from sending unit. Connect a 12-volt, 3.4-watt test bulb between connector terminal and ground. Turn ignition switch to ON position. If test bulb flashes and temperature gauge needle moves, go to SENSOR RESISTANCE TEST. If test light does not flash and gauge needle does not move, repair wiring to sending unit. Sensor Resistance Test Remove thermosensor (sending unit) from engine block. Place sending unit in hot water of 158 F (70 C) temperature. Check sensor resistance with an ohmmeter. Thermosensor resistance should be 90-117 ohms at 158 F (70 C). If thermosensor resistance in okay, go to GAUGE RESISTANCE TEST. Replace thermosensor if resistance is not as specified. Gauge Resistance Test Remove instrument cluster from instrument panel. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Measure resistance between temperature gauge terminals at rear of cluster or combination |