RE: looking for a pst 600 ecu
I have several of the TEMS ECUs left over from TJT engines. I believe (at least at one time) the PSTs were using the TEMS. You could use these, but you would need some way of changing or re-programming all of the parameters in the ECU to make it control a PST 600 rather than a TJT-3000. I am sure PST could tell you how.