Anchors cannot span cells
Is this the code you pasted:
echo "<a href=\"prod_detail.php?SKU=$SKU\"><tr><td>
$FromYear</td><td>
$ToYear</td><td>
$Make</td><td>
$Model</td><td>
$HorsePower</td><td>
$FitmentCodes</td><td>
$DriveTrain</td></tr></a>";
If so, do this and it should accomplish what you want and work:
echo "<tr><td>
<a href=\"prod_detail.php?SKU=$SKU\">$FromYear</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$ToYear</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$Make</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$Model</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$HorsePower</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$FitmentCodes</a></td><td>
<a href=\"prod_detail.php?SKU=$SKU\">$DriveTrain</a></td></tr>";