diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index 4307b4b31..0106bfc68 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -5,6 +5,7 @@
  * Add blend RGB leds with White leds for better whites (#5895, #5704)
  * Add command SetOption41 0..8 to control number of Tuya switches (#6039)
  * Add command SetOption42 0..255 to set overtemperature (Celsius only) threshold resulting in power off all on energy monitoring devices. Default setting is 90 (#6036)
+ * Add command SetOption66 0/1 to enable or disable Tuya dimmer range 255 slider control
  * Add command Time to disable NTP and set UTC time as Epoch value if above 1451602800 (=20160101). Time 0 re-enables NTP (#5279)
  * Add AZ7798 automatic setting of clock display (#6034)
  * Add Epoch and UptimeSec to JSON messages (#6068)
diff --git a/sonoff/settings.h b/sonoff/settings.h
index 0fa7f5d48..8b593f9ec 100644
--- a/sonoff/settings.h
+++ b/sonoff/settings.h
@@ -78,8 +78,8 @@ typedef union {                            // Restricted by MISRA-C Rule 18.4 bu
     uint32_t no_hold_retain : 1;           // bit 12 (v6.4.1.19) - SetOption62 - Don't use retain flag on HOLD messages
     uint32_t no_power_feedback : 1;        // bit 13 (v6.5.0.9)  - SetOption63 - Don't scan relay power state at restart
     uint32_t use_underscore : 1;           // bit 14 (v6.5.0.12) - SetOption64 - Enable "_" instead of "-" as sensor index separator
-    uint32_t tuya_show_dimmer : 1;		     // bit 15 (v6.5.0.15) - SetOption65 - Enable or Disable Dimmer slider control
-    uint32_t spare16 : 1;
+    uint32_t tuya_show_dimmer : 1;		   // bit 15 (v6.5.0.15) - SetOption65 - Enable or Disable Dimmer slider control
+    uint32_t tuya_dimmer_range_255 : 1;    // bit 16 (v6.6.0.2)  - SetOption66 - Enable or Disable Dimmer range 255 slider control
     uint32_t spare17 : 1;
     uint32_t spare18 : 1;
     uint32_t spare19 : 1;
diff --git a/sonoff/xdrv_16_tuyadimmer.ino b/sonoff/xdrv_16_tuyadimmer.ino
index 7f26e035c..f2328cc83 100644
--- a/sonoff/xdrv_16_tuyadimmer.ino
+++ b/sonoff/xdrv_16_tuyadimmer.ino
@@ -146,14 +146,20 @@ void LightSerialDuty(uint8_t duty)
     if (duty < 25) { duty = 25; }  // dimming acts odd below 25(10%) - this mirrors the threshold set on the faceplate itself
 
     if (Settings.flag3.tuya_show_dimmer == 0) {
-
-    	AddLog_P2(LOG_LEVEL_DEBUG, PSTR("TYA: Send dim value=%d (id=%d)"), duty, Settings.param[P_TUYA_DIMMER_ID]);
-
+      if(Settings.flag3.tuya_dimmer_range_255 == 0)
+      {
+        duty = round(duty * (100. / 255.));
+      }
+      AddLog_P2(LOG_LEVEL_DEBUG, PSTR("TYA: Send dim value=%d (id=%d)"), duty, Settings.param[P_TUYA_DIMMER_ID]);
       TuyaSendValue(Settings.param[P_TUYA_DIMMER_ID], duty);
     }
   } else {
     tuya_ignore_dim = false;  // reset flag
     if (Settings.flag3.tuya_show_dimmer == 0) {
+      if(Settings.flag3.tuya_dimmer_range_255 == 0)
+      {
+        duty = round(duty * (100. / 255.));
+      }
       AddLog_P2(LOG_LEVEL_DEBUG, PSTR("TYA: Send dim skipped value=%d"), duty);  // due to 0 or already set
     }
   }
@@ -211,8 +217,14 @@ void TuyaPacketProcess(void)
             AddLog_P2(LOG_LEVEL_DEBUG, PSTR("TYA: Autoconfiguring Dimmer ID %d"), tuya_buffer[6]);
             Settings.param[P_TUYA_DIMMER_ID] = tuya_buffer[6];
           }
-
-          tuya_new_dim = round(tuya_buffer[13] * (100. / 255.));
+          if(Settings.flag3.tuya_dimmer_range_255 == 0)
+          {
+            tuya_new_dim = round(tuya_buffer[13]);
+          }
+          else
+          {
+            tuya_new_dim = round(tuya_buffer[13] * (100. / 255.));
+          }
           if ((power || Settings.flag3.tuya_apply_o20) && (tuya_new_dim > 0) && (abs(tuya_new_dim - Settings.light_dimmer) > 1)) {
             tuya_ignore_dim = true;
 
diff --git a/tools/decode-config.py b/tools/decode-config.py
index 0fe3e274c..3dfd1b500 100755
--- a/tools/decode-config.py
+++ b/tools/decode-config.py
@@ -923,7 +923,13 @@ Setting_6_5_0_15['flag3'][0].update ({
         'tuya_show_dimmer':              ('<L', (0x3A0,1,15), (None, None,                      ('SetOption',   '"SetOption65 {}".format($)')) ),
                                     })
 # ======================================================================
+Setting_6_6_0_1 = copy.deepcopy(Setting_6_5_0_15)
+Setting_6_6_0_1['flag3'][0].update ({
+        'tuya_dimmer_range_255':         ('<L', (0x3A0,1,16), (None, None,                      ('SetOption',   '"SetOption66 {}".format($)')) ),
+                                    })
+# ======================================================================
 Settings = [
+            (0x6050010, 0xe00, Setting_6_6_0_1),
             (0x605000F, 0xe00, Setting_6_5_0_15),
             (0x605000C, 0xe00, Setting_6_5_0_12),
             (0x605000B, 0xe00, Setting_6_5_0_11),