No, you do not.
If you use the CJ Pony part, it is a direct plug and play replacement.
If you use a later model Ford part from a truck, you may have to add a jumper wire for the power to the windshield washer button to work.
If you have or can find an original wiper switch and variable speed module, then it is also plug and play, you just have to hook up the additional ground wire.
I am currently using an original 71-73 Mustang variable speed switch and a module from a 1975+ truck.
It works great.
Turn it right to go up to 3 speeds and turn it left for variable speed.
The two CJ Pony parts switches I tried, quit working after a month or two.
They are not-so-cheap import junk!
I found it cheaper in the long run to buy the Ford parts.
I hope that this helps

__________________
My car is a HYBRID
It Burns both Gas and Rubber!
I am no "EXPERT", but I am willing to learn.
2005 Mustang Gt, Auto, Procharged ~500 RWHP
11.307@122.89 Mph 23 Nov 2008@Cecil County Dragway,MD
1972 Mustang Convertible 5 Speed, 351C-2V ~350 HP
1 of 82 built with a manual transmission and 351C-2V.