Question 40 to 50 way conversion-L body TIII

[GLHS#238]

I am in the process of doing a 40 way to 50 way conversion for a Omni with a TIII engine and I had a few questions.

On the L body they use a Fuel pacer lamp - Orange/Light Green wire that goes to the cluster. What does it do? Is it needed?

Thanks
Deniz

[waterbird808]

i don't know but im doing the same thing. i have an 86 omni non turbo 40way and i have a 86 laser 2.2 turbo 50way as a donor. both are automatic. i probaly can't use the harness from the laser being that ill be using a blow through intake on the 2.2 turbo from the laser. what year and model TIII engine came from.

[GLHS#238]

Its a 91 Spirit.

[detobias]

fuel pacer lamp is also known as a 'shift indicator light' or SIL

designed to tell drivers WHEN to shift for better economy ; many models of cars have these in the instrument clusters but many do not use them - it depends on how the car was originally calibrated (manual trans obviously); anyhoo - not necessary ; you could use it as a warning light or a 'knock sensor' light (custom cal?)

when EPA testing for fuel economy, the automakers can either use the base EPA M/T shifting pattern - 15mph/25/35/45 ; or they can do a customer 'shift survey' to see what speeds customers shift at ; then sometimes they add a SIL which sometimes results in customers shifting a little earlier = better fuel economy