Not sure if this is the right spot to post.

I am in the researching for the upcoming upgrade for the truck and eliminating the TBI system (7747) of my 1991 V1500 Suburban and I will be going with the Edelbrock SMPFI Pro-Flo 4 system. I have 3 circuits I need to keep from the existing harness.

1 The fuel pump - The fuel pump has that oil PSI safety built in so I need to keep it or eliminate it. If it's on its own circuit and not tied into the ECM that's fine.

2 The VSS for speedo - The DRAC for the VSS goes into the ECM. what purpose does this have in the ECM and can I simply just not care about that single wire going into the ECM once I pull the ECM?

3 TCC Lockup - The TCC lockup seems pretty straight forward in getting an aftermarket kit from B&M or monster transmissions etc.


I have Alldata for repairs and lookup but the wiring section of it fails pretty bad compared to Mitchell on demand.