[TKat13]

What window switch do you have? I have a Zex unit that can be programmed based on the shift, such as if you don't want Nitrous in 1st, it will wait until 2nd comes in and then shift. Maybe it is possible that it is not programmed correctly? But, without knowing your window switch model, not sure what else to look at. I would also double check all your connections.

Is the Window switch the ONLY device connected to your RPM signal from the PCM? For instance, I had a similar issue when I had my window switch and shift light tapped onto the same RPM signal. I then moved one of them to a different pin and both worked fine after that.