Very nice Mike, that is exactly the set up on my ST2, the solenoid on the right is connected to the injector pump rack while the one on the left links to the decompression levers on the cylinder head. Should work well for all ST models and probably the earlier SR models.
Interestingly the ST1 runs a 12volt starting battery while the ST2 runs a 24 volt battery, I am unsure if the solenoid windings would be different because of this.
Bob