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FAQ1
COMMON CUSTOMER COMPLAINT: (Applies to all Corvette electrical temperature gauges from 1955 to approximately 1972.) Customer will usually add the following: I know it's not the sending unit. I've already replaced that.
REALITY: ALL, (I mean ALL), each
and every new sending unit that is sold presently is wrong. I don't care what
the parts guy tells you or what the parts manual says, they are wrong. There
is an exception to this, which is to find a New Old Stock (NOS) part. To my
knowledge, these parts have not been available for at least 20 years. Our testing
of a known good original sending unit and the currently available part, shows
that both units read nearly the same - until the water temperature reaches approximately
180 degrees. From that point and higher, the correct sending unit will maintain
accuracy, but the replacement unit will give you a reading that is approximately
30 degrees higher than the actual temperature. Unfortunately, in our opinion,
the addition of a resistor (to alter the reading of the replacement part) is
inappropriate. The readings are not consistent throughout the normal temperature
scale. They do not vary (enough to be a problem) until approximately 180 degrees.
For those of you that have a car that rarely exceeds 180 degrees, you will not
notice an inaccurate reading with the replacement sending unit.
SOLUTION: We currently have a GM licensed
reproduction sending unit with correct calibration for $20.00 each. The appearance
is like the original, including the wording "A.C.- Made in USA.-12 Volt".
You may also replace the sending unit with an original type. It may sound difficult
but through research, we have found that many GM products from the 50's and
60's used a sending unit that will work in your Corvette.
EXAMPLE: Some 6-cylinder applications and any vehicle that used a temperature gauge (not a warning light!) including but not limited to Buick, Cadillac, Chevrolet, etc. Old "junk boxes", salvage yards and flea markets are your best sources. If it "looks" appropriate and has the words "A.C.- Made in USA.-12 Volt" printed (may also have a series of dots or small squares) in the area just above the threads, this is what you are looking for. We have also found that usually the bottom of the unit will be concave or dimpled. Remember…these original sending units are RARELY bad electrically. Sometimes, however, they will leak. Most of the time they were discarded because new parts are so inexpensive and the average owner will install a new one because it "looks nice".
Hope this is some help!