You may try:
-- Yvan KOENIG running High Sierra 10.13.6 in French (VALLAURIS, France) mardi 23 juin 2020 17:30:39
set theBundle to ((path to library folder from system domain as string) & "PreferencePanes:Trackpad.prefPane:") as «class furl»
-- Extrct the local spelling of Trackpad
set trackPad_loc to localized string "CFBundleName" from table "InfoPlist" in bundle theBundle
tell application "System Preferences"
activate
-- id of every pane --> {"com.apple.preference.universalaccess", "com.apple.preferences.appstore", "com.apple.preferences.Bluetooth", "com.apple.preference.desktopscreeneffect", "com.apple.preference.digihub.discs", "com.apple.preference.keyboard", "com.apple.preferences.internetaccounts", "com.apple.preferences.parentalcontrols", "com.apple.preference.datetime", "com.apple.preference.startupdisk", "com.apple.preference.dock", "com.apple.preference.energysaver", "com.apple.preferences.extensions", "com.adobe.flashplayerpreferences", "com.apple.preference.general", "com.apple.preferences.icloud", "com.apple.preference.printfax", "com.oracle.java.JavaControlPanel", "com.apple.Localization", "com.apple.preference.expose", "com.apple.preference.displays", "com.apple.preference.notifications", "com.apple.preferences.sharing", "com.apple.preference.network", "com.apple.preference.security", "com.apple.preference.speech", "com.apple.preference.sound", "com.apple.preference.mouse", "com.apple.preference.spotlight", "com.apple.prefs.backup", "com.apple.preference.trackpad", "com.apple.preferences.users"}
set current pane to pane id "com.apple.preference.trackpad"
tell application "System Events" to tell process "System Preferences"
set frontmost to true
repeat until exists window trackPad_loc -- wait until the window Trackpad is available
delay 0.1
end repeat
-- the disabled instructions show how we may learn which UI elements are available in th interface
tell window trackPad_loc
-- class of UI elements --> {button, button, static text, static text, tab, image, button, button, button, toolbar}
tell tab group 1
-- class of UI elements --> {radio button, radio button, radio button, checkbox, static text, menu button, checkbox, static text, menu button, checkbox, static text, static text, checkbox, static text, menu button, checkbox, static text, menu button, checkbox, static text, static text, checkbox, static text, static text, image}
-- name of radio buttons --> {"Pointer et cliquer", "Faire défiler et zoomer", "Gestes supplémentaires"}
click radio button 1 -- activate the pane Point & click if needed
repeat until exists slider 1 -- wait until the wwanted pane is available
delay 0.1
end repeat
-- class of UI elements --> --> {radio button, radio button, radio button, image, checkbox, static text, static text, checkbox, static text, menu button, checkbox, static text, static text, static text, static text, static text, slider}
-- In this window the checboxes have no name.
-- This is why I used the related static text to identify them
-- name of static text (-2 + (1 * 2))--> "Recherche et détection de données"
-- name of static text (-2 + (2 * 2))--> "Toucher avec 3 doigts"
-- name of static text (-2 + (3 * 2))--> "Toucher pour cliquer"
-- value of every checkbox--> {0, 1, 1}
click checkbox 3 -- check/uncheck "Toucher pour cliquer"
end tell -- tab group 1
end tell -- window trackPad_loc
end tell -- application "System Events"
quit
end tell -- application "System Preferences"
As always, several instructions used to build the code remain as disabled ones.
Yvan KOENIG running High Sierra 10.13.6 in French (VALLAURIS, France) mardi 23 juin 2020 16:49:24