Got some simple suggestions, if you like.

1. Explosion Chamber. A device that generate pressure using TNT. Probably should be purely manual as an early game rapid pressure generator. Probably looks like a chamber with reinforced walls. You shift-click to open it, place tnt inside and close it. Then simple rightclick or flint'n'steel click to explode it giving you rapid 2-3 bars of pressure. Leaving chamber open will cause pressure to leak out.
   

2. Thermometer. A module you attach to any block, and it generate redstone signal depending on temperature. With Advanced PCB you can choose upper and lower limit of temperature then redstone signal is emited, and is it linear or square. Without PCB only upper limit, linear.

3. Liquid Fuel burner. A pipe module you can feed with Liquid fuel and some part of air. This module will heat any block it is facing, works best with Heat Sinks, heating them up to high temperatures, could be alternative to Vortex Tubes. Amount of pressure you feed it will make flame bigger or smaller (from 1 block up to 5 blocks, every 4 bars) or maybe make it consume more fuel per tick, making flame hotter.

1. I like this idea, and I've already been thinking about it. Maybe more of a general "Impact Compressor" which can be powered by either explosions (if properly contained), or by entities hitting it fast enough (generally by falling a significant distance). So that's a possibility for 1.14.4.

2. This can already be done by the Universal Sensor.

3. This can already be done by a Liquid Compressor & Vortex Tube.