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Dakota Digital Tech support said GM has a 'dirty' signal. They sent me this diagram in order to wire in a filter.
Set the first 2 switches to ON and output to 4000ppm and it works. :yay:

I'm wondering if the E40 is the culprit. Most of my friends see screens like the Camaro sample pictured here. Attached is a sample E40 screen which looks very similar to mine with slight trans...

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E40 pcm

Thanks for any help. Trying to make the Midwest f-body event this Sat at Road America, Elkhart Lake WI. Finished everything but this issue. Here's a pic with fresh paint.
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I swapped an LS2/4L65e into my 89 Formula (had L98/700R4). Had the car tuned on a dyno by professional shop. Runs Great!
My speedo is an electronic 140mph speedo (car had a buffer box). At about...

WOW, didn't expect quick help on Holiday weekend.
:hi:

Another unhappy customer over the long weekend :mad:

Initial experiences tend to form lasting impressions :banghead: