*

Unity/Assets/Scripts/Debug/DebugSpeedometer.cs

@@ -0,0 +1,35 @@
+using UnityEngine;
+using System.Collections;
+using System.Linq;
+
+public class DebugSpeedometer : MonoBehaviour
+{
+    public WheelPhysics[] wheels;
+    public Rigidbody car;
+
+	// Use this for initialization
+	void Start () {
+	
+	}
+	
+	// Update is called once per frame
+	void Update () {
+	
+	}
+
+    void OnGUI()
+    {
+        float speed_ms = 0;
+        if (wheels != null)
+        {
+            speed_ms = Mathf.Abs((float)wheels.Select(v => v.angularVelocity*v.TotalWheelRadius).Sum() / wheels.Length);
+        }
+
+        var speed_kmph = (speed_ms*60.0f*60.0f)/1000.0f;
+        var car_speed = car.velocity.magnitude*3.6f;
+
+
+        GUI.Label(new Rect(20, 100, 200, 40), "Wheels speed [km/h]: " + speed_kmph);
+        GUI.Label(new Rect(20, 140, 200, 40), "Real speed [km/h]: " + car_speed);
+    }
+}