Hello again all, I was hoping someone may be able to hlp me out I have searched and searched but can not get a straight awnser

I want to place a aftermarket elec speedo in my RX7 and although the origanal one (bumpy) is cable driven I see in the computer layout in the cluster it does have a speed sensor (possibly for cruise cont) but I wasnt sure if that will work so I thought to ask before I pull car appart again

Any help is appreciated
Thanks Again Guys