Why is Calvinism considered incompatible with Dispensationalism?

What amongst the five Solas and the TULIP concepts are incompatible with Dispensationalism, which I simplisticly understand to mean that the Church has not replaced the literal land and nation of Israel, and the Jews, as the object of God's pronouncements recorded in the Old Testament? My understanding of the Bible and the Gospel would be described as Calvinism before I discovered what Calvinism was! To me it appeared to be the only coherent set of fundamentals, anchored in God's Sovereignty, for Christianity to be internally consistent. My view of Israel flowed from my own, similarly independent conclusions as to the reliability of Scripture, and that was that God would be "dealing" with Israel (the land, the nation, the Jews) per the Old Testament. I saw no inconsistency there whatsoever. Are there **fundamentals** that I don't appreciate in Calvinism and Dispensationalism that make it logically or at least epistemiologically incoherent to "agree" with both?