Delphi Visual Components TSwitch TLed TSlider TProgressShape TGradientProgBar Gauges media vcl gauges circular Composite components Angular Guages

 Delphi Visual Components TSwitch TLed TSlider TProgressShape TGradientProgBar
 Gauges media vcl gauges circular Composite components Angular Guages
http://apetrilla.blogspot.com/2011/10/delphi-visual-components-tswitch-tled.html
 SDL Component Suite - Meter
https://www.lohninger.com/onoffbut.html
https://www.lohninger.com/meter.html

E-XD++ HMI SCADA Graphics Visualization Source Code
HMI SCADA PLC PAC RTU DCS
FlexGraphics Graphics Delphi Components GIS CAD SCADA VISIO
SCADA Tool C++ Source Code
diagram editor Diagram Designer
delphi industrial dashboard HMI SCADA sourceforge
https://sourceforge.net/projects/pascalscada/

https://mitov.com/products/instrumentlab#overview
https://www.mitov.com/screenshots/instrumentlab