diff --git a/.circleci/config.yml b/.circleci/config.yml
index 41f64aa..3fb5c52 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,10 +1,6 @@
 # Use the latest 2.1 version of CircleCI pipeline process engine.
 # See: https://circleci.com/docs/configuration-reference
 version: 2.1
-# set the filter to allow a build for any sha tag
-filters:
-  tags:
-    only: /.*/
 parameters:
   run_build:
     type: boolean
@@ -76,3 +72,7 @@ workflows:
     when: << pipeline.parameters.run_build >>
     jobs:
       - pio-build
+          # set the filter to allow a build for any sha tag
+          filters:
+            tags:
+              only: /.*/
diff --git a/webinstall/cibuild.html b/webinstall/cibuild.html
index deea2fb..98530d6 100644
--- a/webinstall/cibuild.html
+++ b/webinstall/cibuild.html
@@ -10,6 +10,14 @@
     <div class="configui container">
     <h1>Build your own ESP32-NMEA2000</h1>
     <h3>New Build</h3>
+    <div class="row">
+        <span class="label" id="branchOrTag"></span>
+        <span class="value" id="branchOrTagValue">---</span>
+    </div>
+    <div class="row">
+        <span class="label" >GitSha</span>
+        <span class="value" id="gitSha">---</span>
+    </div>
     <div class="row">
         <button id="downloadConfig">SaveCfg</button>
         <button id="uploadConfig">LoadCfg</button>
diff --git a/webinstall/cibuild.js b/webinstall/cibuild.js
index 0a034e9..5143c7a 100644
--- a/webinstall/cibuild.js
+++ b/webinstall/cibuild.js
@@ -4,7 +4,10 @@ import fileDownload from "https://cdn.skypack.dev/js-file-download@0.4.12"
 (function(){
     const STATUS_INTERVAL=2000;
     const CURRENT_PIPELINE='pipeline';
-    let API="cibuild.php";
+    const API="cibuild.php";
+    const GITAPI="install.php";
+    const GITUSER="wellenvogel";
+    const GITREPO="esp32-nmea2000";
     let currentPipeline=undefined;
     let downloadUrl=undefined;
     let timer=undefined;
@@ -15,6 +18,7 @@ import fileDownload from "https://cdn.skypack.dev/js-file-download@0.4.12"
     let displayMode='last';
     let delayedSearch=undefined;
     let running=false;
+    let gitSha=undefined;
     if (! branch) branch='master';
     const modeStrings={
         last: 'Last Build',
@@ -123,6 +127,7 @@ import fileDownload from "https://cdn.skypack.dev/js-file-download@0.4.12"
         setValue('status','requested');
         setValue('pipeline','');
         setRunning(true);
+        if (gitSha !== undefined) param.tag=gitSha;
         param.config=JSON.stringify(config);
         fetchJson(API,Object.assign({
             api:'start'},param))
@@ -324,6 +329,7 @@ import fileDownload from "https://cdn.skypack.dev/js-file-download@0.4.12"
         }
         let param={find:1};
         fillValues(param,['environment','buildflags']);
+        if (gitSha !== undefined) param.tag=gitSha;
         fetchJson(API,param)
             .then((res)=>{
                 setCurrentPipeline(res.pipeline);
@@ -347,6 +353,56 @@ import fileDownload from "https://cdn.skypack.dev/js-file-download@0.4.12"
         }
         structure=await loadConfig("build.yaml");
         buildSelectors(ROOT_PATH,structure.config.children,true);
-        //buildValues();
+        let gitParam={user:GITUSER,repo:GITREPO};
+        let branch=getParam('branch');
+        if (branch){
+            try{
+                let info=await fetchJson(GITAPI,Object.assign({},gitParam,{branch:branch}));
+                if (info.object){
+                    gitSha=info.object.sha;
+                    setValue('branchOrTag','branch');
+                    setValue('branchOrTagValue',branch);
+                }
+            }catch (e){
+                console.log("branch query error",e);
+            }
+        }
+        if (gitSha === undefined) {
+            let tag = getParam('tag');
+            if (!tag) {
+                try {
+                    let relinfo = await fetchJson(GITAPI, Object.assign({}, gitParam, { api: 1 }));
+                    if (relinfo.tag_name) {
+                        tag = relinfo.tag_name;
+                    }
+                    else {
+                        alert("unable to query latest release");
+                    }
+                } catch (e) {
+                    alert("unable to query release info " + e);
+                }
+            }
+            if (tag){
+                try{
+                    let info=await fetchJson(GITAPI,Object.assign({},gitParam,{tag:tag}));
+                    if (info.object){
+                        gitSha=info.object.sha;
+                        setValue('branchOrTag','tag');
+                        setValue('branchOrTagValue',tag);    
+                    }
+                }catch(e){
+                    alert("cannot get sha for tag "+tag+": "+e);
+                }
+            }
+        }
+        if (gitSha === undefined){
+            //last resort: no sha, let the CI pick up latest
+            setValue('gitSha','unknown');
+            setValue('branchOrTag','branch');
+            setValue('branchOrTagValue','master');
+        }
+        else{
+            setValue('gitSha',gitSha);
+        }
     }
 })();
\ No newline at end of file
diff --git a/webinstall/helper.js b/webinstall/helper.js
index 857427c..68dce53 100644
--- a/webinstall/helper.js
+++ b/webinstall/helper.js
@@ -57,7 +57,7 @@ const fillValues=(values,items)=>{
 const setValue=(id,value)=>{
     let el=document.getElementById(id);
     if (! el) return;
-    if (el.tagName == 'DIV'){
+    if (el.tagName == 'DIV' || el.tagName == 'SPAN' || el.tagName == 'P'){
         el.textContent=value;
         return;
     }
diff --git a/webinstall/install.php b/webinstall/install.php
index ed5281e..c3fd6a8 100644
--- a/webinstall/install.php
+++ b/webinstall/install.php
@@ -1,7 +1,10 @@
 <?php
 include("functions.php");
 include("config.php");
-$api = "https://api.github.com/repos/#user#/#repo#/releases/latest";
+const API_BASE="https://api.github.com/repos/#user#/#repo#";
+$api = API_BASE."/releases/latest";
+$branchsha=API_BASE."/git/refs/heads/#branch#";
+$tagsha=API_BASE."/git/refs/tags/#tag#";
 $download = "https://github.com/#user#/#repo#/releases/download/#dlVersion#/#dlName#";
 $manifest = "?dlName=#mName#&dlVersion=#mVersion#&user=#user#&repo=#repo#";
 try {
@@ -10,6 +13,18 @@ try {
 		proxy(replaceVars($api, $vars));
 		exit(0);
 	}
+	if (isset($_REQUEST['branch'])){
+		$vars = fillUserAndRepo();
+		$vars = addVars($vars, array('branch'));
+		proxy(replaceVars($branchsha, $vars));
+		exit(0);
+	}
+	if (isset($_REQUEST['tag'])){
+		$vars = fillUserAndRepo();
+		$vars = addVars($vars, array('tag'));
+		proxy(replaceVars($tagsha, $vars));
+		exit(0);
+	}
 	if (isset($_REQUEST['dlName'])) {
 		$vars = fillUserAndRepo();
 		$vars = addVars($vars, array('dlName', 'dlVersion'));