First actual tip, this creates a Mega Mech. In order to use it though, you have to be on either Abberation or Extinction maps (one or the other) and you have to be near the King Titan. Also takes 4 other techs to properly combine. If you have the extensions, worth it. If not, good luck.
M.O.M.I.
MegaMek Operational Materialization Interface. Drag this to a Mek Module slot to enable forming the MegaMek! Requires three additional nearby Meks to transform. Will fail to operate unless if not in range of the Alpha King Titan.

Recipe
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To make M.O.M.I., combine Element, Metal Ingot, Polymer, Electronics, and Crystal in a Tek Replicator for 10 seconds.