It depends. Most of the time I would say yes. Almost every preach will include the most rudimentary preaching of the Torah, even if it is merely to repent and love YahShua. The more drugged up, doped out, drunken, party going crowd you have, the less you will go deeply into the Torah. Those flesh inflamed crowds need a good pounding on basic repentance and loving YahShua. Although, even in the most party-lusting crowd, the Holy Spirit can bring a sobriety that may open the way to go more in depth on Torah.
Campus preaches are often the best forum to discuss Torah keeping. Merely preaching "repent and perish" or "turn or burn" or "trust Jesus and read the Bible" will do very little in stimulating a sober, intellectual crowd. It is very easy to waste a decent crowd of intellectual students and turn it into a mindless circus by simply preaching the basics. You can certainly begin with those, but a campus crowd will often want to go deeper and find out more.
Once you start preaching the Torah in depth and that YahShua commanded Torah observance for His followers, be prepared to be opposed by almost any Christians on campus. Powerful devils will typically manifest to resist this preaching. Particular hot spots are preaching against the pagan feasts such as Christmas and Easter. Make sure you are prayed up and ready to go before preaching the Torah in depth.
Preaching the Torah, despite the persecution it brings, will bring great reward and blessing. Many of the heathen will be caught off guard. Most sinners and most Christians will have never heard your Torah keeping message before. Although the religious spirits will hate it, many heathen will be intrigued. They will begin to connect the Old Testament with the New and see that YahShua, who was a Jew, didn't come to create a new religion, but simply lift up the original. They will begin to see how the Law of Moses connects with the Sermon on the Mount.
Many will have a respect for you, realizing you take your Christianity so seriously, that you don't ignore its Hebrew roots. Most will realize that you have studied up on what you believe, that you don't ignore hard to deal with scriptures (such as the first two-thirds of the Scriptures)
You will also be presenting a Torah loving, Torah keeping Jesus, foreign to many Christians. This will aid you in reaching Jews. The Messiah you present will be much more recognizable and easier for Jews to accept than the typical Gentile, Torah-nullifying Jesus so many Christians worship.
In every way, preaching Torah will help. The Ruach Ha'Kadosh promises to aid you and make the Torah come alive in your hearers' hearts. Preaching repentance from sin and trusting in YahShua is a very good start, but preaching the rest of Torah will show the nuts and bolts of what repentance means and what obeying YahShua actually requires. The religion you preach will be a rich blend of Hebrew roots and Christianity, far more rewarding than the typical, New-Testament-only Christianity that is packed full with paganism and ignores the Torah completely.
