The “Records of Kirkcaldy, Pathhead Kirk Session”, 1824-1926 are at National Records of Scotland, in Edinburgh, reference number CH2/907. I am not clear if this set of records includes births, marriages, or burials, but it might be a starting point. You may submit a query to National Records at www.nrscotland.gov.uk/about-us/contact-form and they may be able to confirm whether the Kirk Session records contain the original marriage register.
The National Records catalog entry describes this set of records thus: “Kirkcaldy Pathhead was erected as an independent parish on the 16th March 1859 when it was disjoined from Dysart. In 1943, following the union of the Church of Scotland and the United Free Church in 1929, Kirkcaldy Pathhead Parish Church (also known as Kirkcaldy Pathhead East) was united with the former United Free Church congregation of Kirkcaldy Pathhead West. The two sessions united under the name of Kirkcaldy Pathhead and under the ministry of Rev K.B. Citron, minister at Kirkcaldy Pathhead West. The kirk session has fallen within the jurisdiction of the Presbytery of Kirkcaldy throughout its existence.
Old OS maps may be found on the National Library of Scotland website. 1894 map with Pathhead church: https://maps.nls.uk/view/75533608 The 1854 OS map has more detail: https://maps.nls.uk/view/74426849 I see a Free Church Manse on the 1854 map, but not sure if this is the same manse you are seeking.