Got it! For anyone else trying to do this, here's the code:

PHP Code:
<?php
/**
 * new_products.php module
 *
 * @package modules
 * @copyright Copyright 2003-2007 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: new_products.php 6424 2007-05-31 05:59:21Z ajeh $
 */
if (!defined('IS_ADMIN_FLAG')) {
  die(
'Illegal Access');
}

// initialize vars
$categories_products_id_list '';
$list_of_products '';
$new_products_query '';

$display_limit zen_get_new_date_range();

if ( ((
$manufacturers_id && $_GET['filter_id'] == 0) || $_GET['music_genre_id'] > || $_GET['record_company_id'] > 0) || (!isset($new_products_category_id) || $new_products_category_id == '0') ) {
  
$new_products_query "select distinct p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
                                p.products_date_added, p.products_price, p.products_type, p.master_categories_id
                           from " 
TABLE_PRODUCTS " p, " TABLE_PRODUCTS_DESCRIPTION " pd
                           where p.products_id = pd.products_id
                           and pd.language_id = '" 
. (int)$_SESSION['languages_id'] . "'
                           and   p.products_status = 1 " 
$display_limit;
} else {
  
// get all products and cPaths in this subcat tree
  
$productsInCategory zen_get_categories_products_list( (($manufacturers_id && $_GET['filter_id'] > 0) ? zen_get_generated_category_path_rev($_GET['filter_id']) : $cPath), falsetrue0$display_limit);

  if (
is_array($productsInCategory) && sizeof($productsInCategory) > 0) {
    
// build products-list string to insert into SQL query
    
foreach($productsInCategory as $key => $value) {
      
$list_of_products .= $key ', ';
    }
    
$list_of_products substr($list_of_products0, -2); // remove trailing comma

    
$new_products_query "select distinct p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
                                  p.products_date_added, p.products_price, p.products_type, p.master_categories_id
                           from " 
TABLE_PRODUCTS " p, " TABLE_PRODUCTS_DESCRIPTION " pd
                           where p.products_id = pd.products_id
                           and pd.language_id = '" 
. (int)$_SESSION['languages_id'] . "'
                           and p.products_id in (" 
$list_of_products ")";
  }
}
$new_products_query .= " ORDER BY products_date_added DESC
                        LIMIT " 
MAX_DISPLAY_NEW_PRODUCTS;

if (
$new_products_query != ''$new_products $db->Execute($new_products_query);

$row 0;
$col 0;
$list_box_contents = array();
$title '';

$num_products_count = ($new_products_query == '') ? $new_products->RecordCount();

// show only when 1 or more
if ($num_products_count 0) {
  if (
$num_products_count SHOW_PRODUCT_INFO_COLUMNS_NEW_PRODUCTS || SHOW_PRODUCT_INFO_COLUMNS_NEW_PRODUCTS == ) {
    
$col_width floor(100/$num_products_count);
  } else {
    
$col_width floor(100/SHOW_PRODUCT_INFO_COLUMNS_NEW_PRODUCTS);
  }

  while (!
$new_products->EOF) {
    
$products_price zen_get_products_display_price($new_products->fields['products_id']);
    if (!isset(
$productsInCategory[$new_products->fields['products_id']])) $productsInCategory[$new_products->fields['products_id']] = zen_get_generated_category_path_rev($new_products->fields['master_categories_id']);

    
$list_box_contents[$row][$col] = array('params' => 'class="centerBoxContentsNew centeredContent back"' ' ' 'style="width:' $col_width '%;"',
    
'text' => (($new_products->fields['products_image'] == '' and PRODUCTS_IMAGE_NO_IMAGE_STATUS == 0) ? '' '<a href="' zen_href_link(zen_get_info_page($new_products->fields['products_id']), 'cPath=' $productsInCategory[$new_products->fields['products_id']] . '&products_id=' $new_products->fields['products_id']) . '">' zen_image(DIR_WS_IMAGES $new_products->fields['products_image'], $new_products->fields['products_name'], IMAGE_PRODUCT_NEW_WIDTHIMAGE_PRODUCT_NEW_HEIGHT) . '</a><br />') . '<a href="' zen_href_link(zen_get_info_page($new_products->fields['products_id']), 'cPath=' $productsInCategory[$new_products->fields['products_id']] . '&products_id=' $new_products->fields['products_id']) . '">' $new_products->fields['products_name'] . '</a><br />' $products_price);

    
$col ++;
    if (
$col > (SHOW_PRODUCT_INFO_COLUMNS_NEW_PRODUCTS 1)) {
      
$col 0;
      
$row ++;
    }
    
$new_products->MoveNext();
  }

  if (
$new_products->RecordCount() > 0) {
    if (isset(
$new_products_category_id) && $new_products_category_id != 0) {
      
$category_title zen_get_categories_name((int)$new_products_category_id);
      
$title '<h2 class="centerBoxHeading">' sprintf(TABLE_HEADING_NEW_PRODUCTSstrftime('%B')) . ($category_title != '' ' - ' $category_title '' ) . '</h2>';
    } else {
      
$title '<h2 class="centerBoxHeading">' sprintf(TABLE_HEADING_NEW_PRODUCTSstrftime('%B')) . '</h2>';
    }
    
$zc_show_new_products true;
  }
}
?>
That's the entire modules/new_products.php file. If you are using a custom template, be sure to put it in your custom template folder inside the modules folder.

Thanks!