How to use DataTagDecoder.Com

Ease of use is our goal.                      

When taking on a project like this we tried to determine the easiest and most consistent way to enter data so that you the user can get the best and most useful data back from DataTagDecoder.  It was decided that we would use a mainly drop down driven database so that real data would be returned as opposed to generating a page error or worse, incorrect data if the user placed incorrect data in the fields.

You will notice almost immediately that all of the look start basically the same to start with, just a few drop downs available.  Because DataTagDecoder is a dynamic site, the initial data you enter is what determines what drop down data fields are available later down the decoding process by taking a number of factors into account such as year, make, model, assembly plant and several other factors.



Select your tag design by comparing how the codes are layed out on the image.

Enter the following information using the drop down items or entering codes in fields where drop downs are not available.

Select Year by choosing the two digit years available, 1964 would be 64, 1970 would be 70, etc.

Select GM Division Code; 1=Chevrolet, 2=Pontiac, 3=Oldsmobile, 4=Buick, and 6=Cadillac.

Select GM Body Series.  This determines the Model of the vehicle you are researching, for example 2-door Chevelle, 4-dr Vista Cruiser Wagon, 4-door Sedan Deville, etc.

Select GM Assembly Plant.  This either single, two, or three character code determines where the vehicle was assembled.

Enter Fisher Body Sequence number.  This is the internal body number used by Fisher and is assinged to each body that was assembled

Select Interior Trim Number.  This is usually a 3 digit number and it defines the color and sometimes type of interior installed at the assembly plant.

Select Interior Trim Letter.  This is not always used for all cowl tags but it can determine seat type, for example, bucket verus bench seat.

Select Assembly Month.  This determines what month the vehicle was assembled by using a 2 digit month code, 01=January, 02=February, 12=December, etc.

Select Assembly Week. This is a single letter character that determines what week the vehicle was assembled, A=1st week, B=2nd week, etc.

Select Paint Codes.  Paint codes are split into two separate values; Lower Color and Upper Color/Convertible or Vinyl Top Color.  The first digits sigify the lower color, the second digits denote the upper color.

Select Wheel Color Code.  These are not often seen but there are a few insances where the wheel color was denoted on the cowl tag.  Our research shows that this was only previous to 1970.

Enter Accessory Codes;

Accessory Codes from 1967 and earlier, except Fremont, Ca (and a few other assembly plants)

Accessory codes in this group are broken down into 5 separate groups. These groups are prefixed with their corrosponding group, except group 1.  Research shows that there are a number of codes that are present on the tag but cannot be verified as to what the code really means.  We are always researching cowl tags so we will provide the best information available to help define these fields.

Accessory Code from 1968-1972 and Fremont, Ca (and a few other assembly plants) cars from 1964-1967

Accessory codes for this group are not single character codes, but are actually RPO codes siginfied by their 3 character alpha-numeric codes.  This decoder has a limit of 5 codes per tag, but you can investigate RPO codes alone by using our RPODecoder when it becomes available.

Accessory Codes - The Cadillac Factor

Cadillac often used single digit accessory codes that were not broken down into groups like most of the GM assembly plants.  These codes show on the tag as what can be best described as a 'character string' (for example EKMNP) without a preceeding group number.  While most GM assembly plants abandoned the single character and group system starting in 1968, Cadillac continued use of the code layout like this until 1972.

Enter other numbers that do not fall into the above categories.  These codes are often internal numbers for the plant or Fisher Body control numbers.  These are often the most difficult to research becase these numbers are not consistant across all years or assembly plants.  DataTagDecoder.Com can only give a 'best guess' according to available data at this time but we are always researching cowl tags so we will provide the best information available to help define these fields.