Wow so much confusion going in this thread.
1st, some rangers, including the OP's 89, came with speed density EFI and therefore don't have MAF sensors.
2nd, stock speed density ain't gonna handle a turbo. No way, no how, just forget about it.
3rd, the stock 14 lb/hr fuel injectors will not support boost. The factory turbo cars ran 30-35 lb/hr injectors. These are what you need for boost.
4th, you can't run 30-35 lb/hr injectors with a ranger 2.3 computer (speed density or MAF). No way, now how, just forget about it. (Actually you could if there was a way to modify the internal code in the computer. But there isn't currently a way to do this).
5th, like it or not, the only real way to get the turbo charged engine to work right is by using the fuel injection system designed by Ford for the 2.3 turbo motor. You need to get the parts off a factory turbo car (thunderbird turbocoupe or merkur, etc).
6th, there is no practical way to reflash the early EEC-IV computers like the one in your 1989 ranger. Anything 95 and newer can be reflashed easily. Most 1993-1994s can be reflashed to some extent as well. Even a few popular high performance calibration computers like the 5.0 HO, the LA3 for the 88 turbocoupe, and a few other early EEC-IV computers can be re-calibrated. But the speed density 2.3 ranger computer from 1989 is definately not one with enough recalibration demand for anyone to bother deciphering the internal BIN files. Therefore all anyone could do with it is download the BIN file to a laptop and stare in confusion at the nonsense computer language.
In some applications where a MAF system is used and the fuel injectors have some spare capacity (such as in the 1991-1994 4.0L MAF systems with 19 lb/hr injectors) you can get by with a low amount of boost (up to 5 psi maybe) on the stock system without anything going too horribly wrong. But the 14 lb/hr injectors in the ranger 2.3 system just don't have any reserve capacity left.
Bottom line is that you need to take the advice of all the experienced 2.3 turbo people here and go get the complete computer, injectors, and VAM (vane air flow meter), system off a factory ford turbo car. This will be the simplest, cheapest, and best method of getting a 2.3 turbo to work in a ranger.