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Econolines are known for wiring chafes around the PCM area. You may want to look at the harnesses in that area more closely
I would not try the PCM swap from the F to the E without programming the module first.
when you lose the speedo do you get various other warning lights on the dash? Do you loose the tach too? I have only had one bad PCM in an econoline 6.0 and it was doing something similar, it was actually losing communication with the other modules on the HS-CAN network, it wasn't affecting the engine running but everything else related to that network was messed up (Instrument cluster and transmission shifting).
The thing that totally sealed the deal was the fact that I had codes for the PCM losing communication with the TCM, since the are both contained in one module it only stood to reason the fault was internal.
Ford Senior Master Tech
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Last edited by sinner6.0L; 11-10-2013 at 04:43 PM.