[Christ]

was the engine still spinning while the car was off? You'll feel/know the difference immediately if the engine is still spinning, not to mention that when you turn the key back on (or in some cases, even while it's off) the tach will still show RPM immediately.

If you're in lockup mode, chances are, you're not going fast enough for it to work.

Since you have a tach, drive in 2 or L until you get up to about 2000 to 2500 RPM, then shut the key off and leave it in gear.

As soon as you turn the key off while you're in lockup mode, the TCM/ECM unlocks the torque convertor.. it's an electronic feature. Which means that you're way outside the realm of the engine starting back up when you turn the key back on.