Problem on finding sequence of Taq polymerase
According to the paper here "Taq polymerase" is the DNA polymerase I from Thermus aquaticus. (Incidentally the paper has the complete sequence of the gene in question.)

You can find a protein sequence entry at NCBI here. This shows the sequence of amino acids in the protein, not the DNA sequence of the gene. Several lines from the top you will see:


  DBSOURCE    locus TTHDNAP accession D32013.1


with the last word highlighted as a link. Follow that link to the DNA sequence. That entry includes the line:


  CDS             1..2499


which tells you that the initiator ATG of the gene is right at the start of the sequence shown, but that the 3026 bp sequence includes a lot of downstream DNA. If you click on CDS on that line it will highlight the coding sequence in the DNA.   

A very cursory comparison of this sequence with the one in the paper that I linked to suggests that this is the same gene.