Another ref to install FAQ (#8473)

content/en/docs/setup/install/_index.md

@@ -3,11 +3,15 @@ title: Installation Guides
 linktitle: Install
 description: Choose the guide that best suits your needs and platform.
 weight: 20
+content_above: true
 aliases:
     - /docs/setup/kubernetes/install/
 test: n/a
 ---
 
+If you need help choosing, refer to our
+[which Istio installation method should I use?](/faq/setup/#install-method-selection) FAQ page.
+
 {{< tip >}}
 Istio {{< istio_version >}} has been tested with these Kubernetes releases:
 {{< supported_kubernetes_versions >}}.