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Firstgenforever

Aug 4, 2024 04:25 PM

Speedometer help

my computer fried so I am trying to hard wire the Speedo. I saw on here that all you have to do is ground the blue wire on the vss now when I drive the needle goes all over the place and won’t stay still any suggestions? I was thinking not a good enough ground I have a 91.5 w250

Firstgenforever

Aug 5, 2024 07:23 PM

Anyone got any ideas?[dummy]that’s for me

Firstgenforever

Aug 5, 2024 09:31 PM

I already replaced the vss

oliver foster

Aug 6, 2024 05:55 AM

'91.5 is a special 1/2 year wire harness and PCM.
Just an FYI as the wiring is different than the '92/'93 trucks that also have a PCM

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