diff --git a/src/main/scala/barstools/tapeout/transforms/GenerateTopAndHarness.scala b/src/main/scala/barstools/tapeout/transforms/GenerateTopAndHarness.scala
index 44aa37cf3b..448d6b1a00 100644
--- a/src/main/scala/barstools/tapeout/transforms/GenerateTopAndHarness.scala
+++ b/src/main/scala/barstools/tapeout/transforms/GenerateTopAndHarness.scala
@@ -15,6 +15,12 @@ import logger.LazyLogging
 // and a second to remove those modules to generate the test harness
 private class GenerateTopAndHarness(annotations: AnnotationSeq) extends LazyLogging {
   val outAnno: Option[String] = annotations.collectFirst { case OutAnnoAnnotation(s) => s }
+  val harnessConf:    Option[String] = annotations.collectFirst { case HarnessConfAnnotation(h) => h }
+
+  val annoFiles: List[String] = annotations.flatMap {
+    case InputAnnotationFileAnnotation(f) => Some(f)
+    case _                                => None
+  }.toList
 
   // Dump firrtl and annotation files
   protected def dump(
@@ -49,6 +55,31 @@ private class GenerateTopAndHarness(annotations: AnnotationSeq) extends LazyLogg
         throw new Exception(s"executeTop failed while executing FIRRTL!\n")
     }
   }
+
+  // Top and harness generation
+  def executeTopAndHarness(): Unit = {
+    executeTop()
+
+    // For harness run, change some firrtlOptions (below) for harness phase
+    // customTransforms: setup harness transforms, add AvoidExtModuleCollisions
+    // outputFileNameOverride: change to harnessOutput
+    // conf file must change to harnessConf by mapping annotations
+    val generatorAnnotations = annotations
+      .filterNot(_.isInstanceOf[OutputFileAnnotation])
+      .map {
+        case ReplSeqMemAnnotation(i, _) => ReplSeqMemAnnotation(i, harnessConf.get)
+        case anno                       => anno
+      }
+
+    val annos = new FirrtlStage().execute(Array.empty, generatorAnnotations)
+    annos.collectFirst { case FirrtlCircuitAnnotation(circuit) => circuit } match {
+      case Some(circuit) =>
+        dump(circuit, annos)
+      case _ =>
+        throw new Exception(s"executeTop failed while executing FIRRTL!\n")
+    }
+  }
 }
 
-object GenerateTop extends StageMain(new TapeoutStage)
+object GenerateTop extends StageMain(new TapeoutStage(doHarness = false))
+object GenerateTopAndHarness extends StageMain(new TapeoutStage(doHarness = true))
diff --git a/src/main/scala/barstools/tapeout/transforms/stage/TapeoutStage.scala b/src/main/scala/barstools/tapeout/transforms/stage/TapeoutStage.scala
index 2ba0bdb892..9de5e04f56 100644
--- a/src/main/scala/barstools/tapeout/transforms/stage/TapeoutStage.scala
+++ b/src/main/scala/barstools/tapeout/transforms/stage/TapeoutStage.scala
@@ -27,23 +27,41 @@ object OutAnnoAnnotation extends HasShellOptions {
   )
 }
 
+case class HarnessConfAnnotation(harnessConf: String) extends NoTargetAnnotation with TapeoutOption
+
+object HarnessConfAnnotation extends HasShellOptions {
+  val options: Seq[ShellOption[_]] = Seq(
+    new ShellOption[String](
+      longOption = "harness-conf",
+      shortOption = Some("thconf"),
+      toAnnotationSeq = (s: String) => Seq(HarnessConfAnnotation(s)),
+      helpText = "use this to set the harness conf file location"
+    )
+  )
+}
+
 trait TapeoutCli {
   this: Shell =>
   parser.note("Tapeout specific options")
 
   Seq(
     OutAnnoAnnotation,
+    HarnessConfAnnotation,
   ).foreach(_.addOptions(parser))
 }
 
-class TapeoutStage extends Stage {
+class TapeoutStage(doHarness: Boolean) extends Stage {
   override val shell: Shell = new Shell(applicationName = "tapeout") with TapeoutCli with ChiselCli with FirrtlCli
 
   override def run(annotations: AnnotationSeq): AnnotationSeq = {
     Logger.makeScope(annotations) {
       val generator = new GenerateTopAndHarness(annotations)
 
-      generator.executeTop()
+      if (doHarness) {
+        generator.executeTopAndHarness()
+      } else {
+        generator.executeTop()
+      }
     }
     annotations
   }