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Corvette Parts, Service and Sales 800-588-3883 Orders 1958-1982 Temperature Gauge Input Readings Every week we get multiple questions about the sending units and the dash temperature gauges. We have tested every brand of temperature units available and feel that it would be better to let you know the input requirements per gauge rather than the output of the sending units. For years the Delco Chart was the accepted rule for checking all mechanical gauges. Bad news is, this chart is wrong! All gauges do not require the same input to reach a specific temperature. We've had a "Help and Repair" page on the web site for several years and this chart was listed on that page! I guess it's time for it to come down and this will be an update to that page! Another issue with all small gauges is the actual gauge condition. Inside the inner workings of a small gauge, there is a spindle connected to a round disc magnet! This magnet is floating in oil and if this oil is missing, dried and thick it can change the reading and/or the responsiveness of the gauge. (Ever see a fuel gauge move and jump at every tiny movement of a car). Most temperature gauges that read wrong are not defective and the problem is in the sending unit! If you purchased a new GM sender, take it back! Today’s current service replacement sender from GM will not send the correct ohms reading to the gauge. The original GM sender 1513321 was replaced by GM p/n 12334869, the only thing halfway correct was the appearance. If you cars shows hot, yet appears, drives and functions fine then the problem is probably an improper sending unit! Adding resistance (a resistor added inline to adjust the ohms reading) on the sending unit wire is not the answer! The temperature gauges are non linear gauges so adding resistance will allow you to dial in a gauge to one reading only. You will be fine if you decide to add resistance and it is a quick fix that will not hurt the gauge! To make sure the temperature sender you have is sending the correct readings to the gauge verify it with the charts listed below. OK.. disclaimer time.... The following pages contain testing results on multiple gauges per year. In most cases NOS gauges were used for testing to obtain an average. Your Readings may vary and this is only our sample test! To correctly know what ohm's input is required for your gauge, you'll need to purchase a linear potentiometer and substitute it for your sending unit. Willcox is not responsible for errors or any incurred damages including parts and/or labor. The following information should be used only as a guide and your own findings may vary! Use at your own risk! 1958-1960 Temperature Gauge Test results Gauge Face Close up Gauge Unit tested: T106, T221, T227 58-60 Gauge Temp or Face Mark. 100 1st mark (dot) 180 2nd mark (dot) 220 Input OHMS required 222 148 96 71 63 1961-1962 Temperature Gauge Test results Gauge Temp or Face Mark. 100 1st mark 180 2nd mark 240 Input OHMS required 282 150 96 80 62 Basic Wiring Schematic for 1958-1962 Temperature Gauges. 1963-1964 Temperature Gauge Test results. Gauge Face 1963 Gauge Face 1964 Units tested: 1963 NOS T111 & 1964 T110 T109 and NOS T110 YEAR 1963-1964 Gauge Temp or Face Mark. 340 1st mark 180 2nd mark 240 Input OHMS required 100 170 128 96 68 1965 Temperature Gauge Test results. YEAR 1965 TEMP OR MARK 100 1ST MARK 210 2ND MARK 250 OHMS 274 109 79 65 51 1966-1967 Temperature Gauge Test results. Gauge Face. Units tested: T101 – T104 - T105 YEAR 1966-1967 TEMP OR MARK 100 1ST MARK 210 2ND MARK 250 OHMS 274 109 79 65 51 1968-1974 Temperature Gauge Test results. Gauge Face Note 1968-1971 Green Face 1972-1974 White Face YEAR 19681974 TEMP OR MARK OHMS 100 1ST MARK 210 2ND MARK 250 220 109 79 65 51 1975-1977 Temperature Gauge Test results. YEAR 1975-1977 TEMP OR MARK OHMS 100 1ST MARK 200 2ND MARK 280 Center Gauge Printed Cricuit 77 and 78-82 340 281 79 56 38 1980-1982 Temperature Gauge Test results YEAR 19801982 TEMP OR MARK OHMS 100 1ST MARK 200 2ND MARK 3RD MARK Front Edge of Red Back Edge of Red 1977 and 1978-1982 Center Gauge Cluster Printed Circuit. 793 219 146 103 85 69 59 And last of all.. face readings... that a gauge can tell you! Copyright Willcox Inc. 2010 all rights reserved. Duplication with out expressed written permission strictly prohibited. Willcox assumes no responsibility for broke or damaged parts caused by errors or following these instructions. As with any repair, use your own judgment.