diff --git a/src/dashboard/api.py b/src/dashboard/api.py
index e5e1922..7483cdc 100644
--- a/src/dashboard/api.py
+++ b/src/dashboard/api.py
@@ -571,11 +571,15 @@ async def get_signals():
                 ])
                 
                 # Modbus signals for this pump
+                # Use consistent register addresses for each pump type
+                pump_num = int(pump_id.split('_')[1])  # Extract pump number from PUMP_001, PUMP_002, etc.
+                base_register = 40000 + (pump_num * 10)  # Each pump gets 10 registers starting at 40001, 40011, etc.
+                
                 signals.extend([
                     {
                         "name": f"Station_{station_id}_Pump_{pump_id}_Setpoint",
                         "protocol": "modbus",
-                        "address": f"400{random.randint(1, 99)}",
+                        "address": f"{base_register + 1}",
                         "data_type": "Integer",
                         "current_value": f"{random.randint(0, 500)} Hz (x10)",
                         "quality": "Good",
@@ -584,7 +588,7 @@ async def get_signals():
                     {
                         "name": f"Station_{station_id}_Pump_{pump_id}_ActualSpeed",
                         "protocol": "modbus",
-                        "address": f"400{random.randint(1, 99)}",
+                        "address": f"{base_register + 2}",
                         "data_type": "Integer",
                         "current_value": f"{random.randint(0, 500)} Hz (x10)",
                         "quality": "Good",
@@ -593,7 +597,7 @@ async def get_signals():
                     {
                         "name": f"Station_{station_id}_Pump_{pump_id}_Power",
                         "protocol": "modbus",
-                        "address": f"400{random.randint(1, 99)}",
+                        "address": f"{base_register + 3}",
                         "data_type": "Integer",
                         "current_value": f"{random.randint(0, 750)} kW (x10)",
                         "quality": "Good",
@@ -602,7 +606,7 @@ async def get_signals():
                     {
                         "name": f"Station_{station_id}_Pump_{pump_id}_Temperature",
                         "protocol": "modbus",
-                        "address": f"400{random.randint(1, 99)}",
+                        "address": f"{base_register + 4}",
                         "data_type": "Integer",
                         "current_value": f"{random.randint(20, 35)} °C",
                         "quality": "Good",