We have developed a technique to select candidate variable white dwarfs from Gaia DR2 by selecting white dwarfs with anomalously large mean G-band flux errors at a given mean G-band magnitude. We demonstrate the technique with the Gaia DR2 sample of white dwarfs within 200 pc. We have followed up many objects with the 2.1m at McDonald Observatory and the 0.9m at Cerro Tololo Inter-American Observatory, and confirmed that several are new high-amplitude pulsating white dwarfs. Two of these new pulsating white dwarfs are brighter than G<13.8 mag, and are excellent targets for extended study from space by TESS.