There are a number of excellent conservative groups that perform rating and scorecards.
84th Texas State Legislature (2015)
Rice University Differential Results (last session to this one)
COMPOSITE SCORECARD (coming)
The Rice University study is the most complete, ranking nearly EVERY significant vote (Here is the State Senate version). More data points, more accuracy. Here is a copy of their House graphic. And their Senate one.
The EmpowerTexans scorecard is absolutely the BEST on fiscal conservatism and government overreach. Over 90 votes involved in the decision.
The Texas Eagle Forum Scorecard, a good source for a more socially conservative ranking can be found here (in good downloadable formats).
83RD Texas State Legislature (2013)
Collin County Conservative Republicans:
NE Tarrant County Tea Party: draft scorecard