MIs for this parish are included in the Devon FHS index - see under Cemeteries on the main Devon page.
A transcription of the Memorial Inscriptions for the Church of St Maurice is held in the Society of Genealogist's Library, in Vol. 8 of Devon Memorial inscriptions (DE/M23).
Brown, Mike. Guide Notes to Monuments in Devon Churches & Graveyards: Plympton St Mary, Plympton St Maurice. The Dartmoor Press. 16pp. [Strode, Trelawny]
[Monumental Inscriptions (church)], Gent. Mag., vol. II, (1830) pp.302-3.
You can see maps centred on OS grid reference SX545557 (Lat/Lon: 50.383074, -4.047968), Plympton St Maurice which are provided by: