ECM reflashing

I had no problem starting the car. The car started with the reflashed ECM. The tach did not work, the speedo was all over the place, the battery light was on, and so was the CEL.

I think there is a bit of confusion in regard to my question.

I purchased a used ECM that was reflashed to my VIN number. When I installed it, the car turned over on the first try. Right away, the tach was not working but the speedometer was acting like the tach (give a little gas and the speedo would rev up and down), the battery light was on, CEL light came on (scanner came up with P0785 and P0740-tranny codes). The anti-theft light never came on. I was able to reverse all over the place but going into drive caused it to stall.

I understand about the Passlock system. I had to replace a battery about 3 years ago and went through the procedure to get it running.

So to reword my question; should an ECM that has been reflashed to my specific vehicle act his way (causing codes, strange gauge reacion, etc.) Upon installation?

From my experience, it would seem to me that the ECM is bad and if there is a recall like you stated, it is possible I got another bum computer. The seller feels the ECM is bad becasue he stated it should not start up on the first try with a Passlock equipped car.

I just want to make sure that before I go to the trouble of returning this ECM that I am not overlooking something.

Thanks again