I have been using a turn signal controller on my antique vehicles for many years that I consider to work very well and is easy to install. The unit is compact and easy to wire.
Go to
https://www.smelectrotech.com/ and select products for a complete listing of features. This unit works on 6 or 12 volt positive or negative ground and can handle incandescent and LED lights. I have the control mounted behind the drivers side kick panel and use a momentary switch mounted hidden behind the dash as the directional switch. A column mounted lever type switch is also offered. The control has many functions that other units do not offer plus its made in USA.