you would need to add code to attach the eCart object, to the email template page and show the total, for example:
<?php
//WA eCart Include
require_once("../../../WA_eCart/yourCartName_PHP.php");
?>
<?php
$yourCartName->GetContent();
?>
<?php echo WA_eCart_DisplayMoney($yourCartName, $total); ?>
where "yourCartName" is the name of your eCart object.