I've successfully split the 4L60E 40 PPR for both a '0411 PCM and Dakota Digital Electronic Cable Drive Speedometer Control Unit ECD-100:...

13447

Maybe it's possible to split / splice the VSS into two signals (4 wires)? Have two wires to the DRAC / VSSB to operate the Speedometer and have two wires for the '0411 PCM?

The DRAC /...

https://www.youtube.com/watch?v=d-1do_t2Xmw

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dave w

There are several ways to accomplish your wiring goals. A good first step would be to Identify and label the necessary wires. Be careful about wire colors, for example the fuel pump relay wire is...

Planning is a good thing when re-wiring.

The option to delete the '0411 fuse block is a solid plan.

The list of old TBI wiring that can be reused:
Fuel Pump Relay wiring.
Battery +
Battery...

Merging wire harness is very challenging!

I've worked with several L31 conversions on the 1986 - 1995 pickups, re-using all the original TBI harness.

For 1986 - 1992 an upgrade to the...