The non-invasive measurement of in-material states of stress and strain within loaded targets is a paradigm that has yet to be fully achieved. However great advances have been made using manganin sensors to achieve this goal. The gauge element for measuring the lateral stress component was redesigned from a grid configuration to a T shaped wire or foil and further the flow around the gauge was investigated by several workers numerically and experimentally and shown to be stable and tracking changes in state faithfully. Finally a staged refinement of the analysis used to deconvolve the change in resistance back to stress has given a device now fit for use as a fiducial over the range of stresses up to the weak shock limit where homogeneous and hydrodynamic behaviour ensue. This work brings together latest refinements in gauge use with comparisons with other techniques. One of these concerns the tracking of elastic-plastic transitions in target materials due to the rapid gauge response. In particular we show broad agreement with the analysis of material strength using the deconvolution due to Asay and Lipkin and attempt to reconcile the two techniques here.