For 1990-1992 NA ECUs:
These are "8-bit" models that use a standard 28 pin DIP EPROM chip. (FYI: the term 8-bit is a misnomer - these ECUs are 16-bit capable processors - the Hitachi 6303 has a double accumulator which makes 16-bit calculations possible.) Cali models contain additional circuit components to enable the EGT sensor within the EGR system as well as circuit components to enable injector leak testing.
They only have circuitry to control either an on/off for the auxiliary fan.
They only have circuitry to control 2 pump speeds (low and high)
They do not have circuitry to control boost solenoids. So long as you intend on using the NA FPC, NA aux fan, and have some other means to control boost pressure, you can install a chip with an NA base program tailored for use in a turbocharged configuration and everything will work just fine. If you want to have all of the features of the TT setup you will have to add components to the ECU's circuitboard, add in the additional control lines, change out the FPC, add in a TT aux fan and control relay, and install boost solenoids. IMHO, all you would ever really want to do is go to the 3speed fuel pump control module setup as this will prevent regulator overrun in high vacuum open throttle conditions. In this condition the TT ECU/FPC runs the pump at a ~75% duty which will prevent regulator overrun. It will also wear the pump less. Best approach to this is just to buy a TT ECU, run the additional control line, use a TT FPC, and start with a TT base program. For the 1993-1995 NA ECUs, these are "16-bit" models and are very different in a number of ways. I dont think you are trying to use one of these in your application but if you are, I will be happy to elaborate. In short, what you have been told will work - this is something I do frequently for our customers needing ECUs upgraded for NA-TT conversions.. Just take what I mentioned into consideration when choosing what other parts to use in the conversion and you'll be fine.
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