Engraving Source Code for Michael - Just Replace "FORMID" with your form ID number and all is good to go.

Engraving Source Code for Michael

<?php

add_filter('gform_pre_render_FORMID', 'populate_posts_FORMID');
function populate_posts_FORMID($form) {
    ?>
    <script>
        var flag = true;
        var checkExist = setInterval(function () {
            if (jQuery('form#gform_FORMID').hasClass('cart')) {
                jQuery('.engraving_loader').remove();
                clearInterval(checkExist);
            } else if (flag) {
                flag = false;
            }
        }, 100);
    </script>
    <?php
    global $product;
    foreach ($form['fields'] as &$field) {
        if ($field->type != 'select') {
            continue;
        }
        $array = (array) $product;
        $prefix = chr(0) . '*' . chr(0);
        $sku = $array[$prefix . 'data']['sku'];
        if (!empty($sku)) {
            $choices = array();
            $choices[] = array('text' => $sku, 'value' => $sku);
            $field->choices = $choices;
        }
    }
    return $form;
}