diff --git a/Kit/Widgets/Tachometer.swift b/Kit/Widgets/Tachometer.swift
index 41d78dc9..746e825c 100644
--- a/Kit/Widgets/Tachometer.swift
+++ b/Kit/Widgets/Tachometer.swift
@@ -13,6 +13,7 @@ import Cocoa
 
 public class Tachometer: WidgetWrapper {
     private var labelState: Bool = false
+    private var monochromeState: Bool = false
     
     private var chart: TachometerGraphView = TachometerGraphView(
         frame: NSRect(
@@ -45,6 +46,7 @@ public class Tachometer: WidgetWrapper {
             ])
         } else {
             self.labelState = Store.shared.bool(key: "\(self.title)_\(self.type.rawValue)_label", defaultValue: self.labelState)
+            self.monochromeState = Store.shared.bool(key: "\(self.title)_\(self.type.rawValue)_monochrome", defaultValue: self.monochromeState)
         }
         
         self.draw()
@@ -69,7 +71,15 @@ public class Tachometer: WidgetWrapper {
         self.setWidth(self.size + x)
     }
     
-    public func setValue(_ segments: [circle_segment]) {
+    public func setValue(_ list: [circle_segment]) {
+        var segments = list
+        
+        if self.monochromeState {
+            for i in 0..<segments.count {
+                segments[i].color = segments[i].color.grayscaled()
+            }
+        }
+        
         DispatchQueue.main.async(execute: {
             self.chart.setSegments(segments)
         })
@@ -87,6 +97,13 @@ public class Tachometer: WidgetWrapper {
             state: self.labelState
         ))
         
+        view.addArrangedSubview(toggleTitleRow(
+            frame: NSRect(x: 0, y: 0, width: view.frame.width, height: Constants.Settings.row),
+            title: localizedString("Monochrome accent"),
+            action: #selector(toggleMonochrome),
+            state: self.monochromeState
+        ))
+        
         return view
     }
     
@@ -106,4 +123,16 @@ public class Tachometer: WidgetWrapper {
         self.chart.setFrameOrigin(NSPoint(x: x, y: 0))
         self.setWidth(self.labelState ? self.size+x : self.size)
     }
+    
+    @objc private func toggleMonochrome(_ sender: NSControl) {
+        var state: NSControl.StateValue? = nil
+        if #available(OSX 10.15, *) {
+            state = sender is NSSwitch ? (sender as! NSSwitch).state: nil
+        } else {
+            state = sender is NSButton ? (sender as! NSButton).state: nil
+        }
+        
+        self.monochromeState = state! == .on ? true : false
+        Store.shared.set(key: "\(self.title)_\(self.type.rawValue)_monochrome", value: self.monochromeState)
+    }
 }
diff --git a/Kit/extensions.swift b/Kit/extensions.swift
index 557bcff4..c0391e6b 100644
--- a/Kit/extensions.swift
+++ b/Kit/extensions.swift
@@ -413,6 +413,15 @@ public extension NSColor {
         let blue  = CGFloat(b) / 255.0
         self.init(red: red, green: green, blue: blue, alpha: alpha)
     }
+    
+    func grayscaled() -> NSColor {
+        guard let space = CGColorSpace(name: CGColorSpace.extendedGray),
+              let cg = self.cgColor.converted(to: space, intent: .perceptual, options: nil),
+              let color = NSColor.init(cgColor: cg) else {
+            return self
+        }
+        return color
+    }
 }
 
 public extension CATransaction {
diff --git a/Kit/plugins/Charts.swift b/Kit/plugins/Charts.swift
index c665ffa0..b8032e02 100644
--- a/Kit/plugins/Charts.swift
+++ b/Kit/plugins/Charts.swift
@@ -22,7 +22,7 @@ public enum chart_t: Int {
 
 public struct circle_segment {
     public let value: Double
-    public let color: NSColor
+    public var color: NSColor
     
     public init(value: Double, color: NSColor) {
         self.value = value
diff --git a/Stats/Supporting Files/pl.lproj/Localizable.strings b/Stats/Supporting Files/pl.lproj/Localizable.strings
index e03de4a8..f53f57da 100644
--- a/Stats/Supporting Files/pl.lproj/Localizable.strings	
+++ b/Stats/Supporting Files/pl.lproj/Localizable.strings	
@@ -258,7 +258,7 @@
 "Based on pressure" = "Na podstawie obciążenia";
 "System accent" = "Akcent systemowy";
 "Monochrome accent" = "Akcent monochromatyczny";
-"Clear" = "Wyczyść";
+"Clear" = "Przezroczysty";
 "White" = "Biały";
 "Black" = "Czarny";
 "Gray" = "Szary";