TL stopped recording boost.

[V6POWER]

My TL stopped recording accurate boost. During one run it showed 5.0 and my aftermarket in-car gauge showed 23. On other runs it showed 8.8 and 7.8 when the aftermarket in-car boost gauge was showing 20 (I turned it down) . I am running the boost harness and Extender chip. I have the parameter setting at Scanmaster W + boost + Extender. This is the setting that I have always used and it has always recorded boost. Any suggestions? Thanks.

 

[V6POWER]

Forgot to add this. I changed from the Turbotweak chip to the Extender. Does TL need to be set to Scanmaster Y or Z, instead of W for the fast update Extender chip?