Well I have a 92 st185 with a 3rd gen mr2 ecu. Not sure how much the ecu will cost you id say $100-$350. As for wiring the 92-93 will only need about 5 wires to be moved. The rest are strait forward to the 3rd gen ecus. The ignitor is the same part # as any 5sfe celicas (94+), tercels, RAV4s mr2s, and camrys. There are 2 part #s and I have tested both parts and they work. I paid $15 or so for them. If you do not change this your rev limiter will be at 5500 rpms no other side effects. THe map sensor is like $280 but I didnt notice any change in my car after changing it. My theory is that 92-93 map sensors are the same as the 3rd gens because 90-91 st185s have 12psi fuel cuts and 92-93s have 15psi fuel cuts. I theorized that the difference in fuel cuts are due to the map sensor. I wouldnt waste your money on the map sensor since you have a 92. Save the $ and get a super afc or emanage or some other fuel controller. THe mat i used a GM one. The iat I used a resistor. Didnt really see anything else that needed to be done except disconnect the egr. If you get the st205 ecu I know that you have to put in a resistor for the intercooler water level so it doesnt go into safe mode. Hope this helps.
John 92 st185
03 g35 coupe
You will need
205 ECU ~$300
Harness ~$200 (you can rewire it yourself, 17 wires more, and save on this)
igniter
map
mat
iat
radiator sensor (?)
disconnect , if there the 02 sensor heater and place an resistor , Tvis, Egr
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