First I want to thank everyone who replyed to my post about needing a Si ECU.

Good news for me is a buddy of mine actually had one laying around he just gave me! YAY!

Now the problem is how do Im know what year its from?

A few labels on the ECU

'90.4.12 "stamped in blue"

37820-pm6-a09
620-326576MK "sticker"

Is 90.4.12 maybe showing its from a 90?

 

that its the date
90 =year
4=month
12=day
u got an ECU that its from April 12, 1990....
those letter are basically in every ecu and tells u the date produced.,.. also can let u identify if its a transition ecu from yr to yr

 

that is affirmative!

 

Thanks