red blue white is actually a s2 ecu with no knock sensor

blue red blue is a s1 ecu

all erst ecus can run roughly 8 psi as std apart from a 90 spec one which can run 10 psi

unscrew the back of the ecu then unsrew the board from the casing then turn it over and have a look at the chip, if its a aftermarket one it should have a sticker on it saying which company fitted it if ur not sure then post up a pic of it on here