header update

wp-content/themes/marcellus/header.php

@@ -29,7 +29,18 @@ j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
 </script>
 <!-- End Google Tag Manager -->
 
+<script>
+    document.addEventListener( 'wpcf7submit', function( event ) {
+    
+        window.dataLayer = window.dataLayer || [];
+        window.dataLayer.push({
+        'event' : 'Contact Us',
+        'userId' : <?php echo rand(0,1000); ?> //this number must be replaced with an actual User ID
+    });
 
+    }, false );
+
+</script>
 <link rel="stylesheet" href="<?php echo get_stylesheet_directory_uri(); ?>/css/bootstrap.min.css">
 <link rel="stylesheet" href="<?php bloginfo('template_directory'); ?>/css/owl.carousel.min.css">
 <link rel="stylesheet" href="<?php bloginfo('template_directory'); ?>/css/owl.theme.default.min.css">