Wiring harness install

Hello, I just recently recieved my converted Nelson wiring harness, I have a few questions. The truck is a 95 chevy 1/2 ton 2wd, and I am using my original 95 4L60E, the harness I sent them is the one that came off of my 03 6.0, my motor was out of a 03 2500HD with a 4L80E. So I had them convert my harness to run a 4L60E, and also remove the rear O2's, evap, etc., first question is the VSS sensor plug is different, can I solder on my original 95's pigtail to the new harness, and have it work, also I guess there is not supposed to be anything hooked to the module on the side of the shift arm because that wiring has been removed. Second question for some reason they left all of the air compressor wiring in my harness, I thought it was supposed to be removed, because I would be using my 95 ac wiring, am I right or not?. Third question there is a large white connector about 12 inches from the main 2 computer plugs, I have no idea what this is for, or if it's needed. It doesn't match up to anything, I already have the complete motor hooked up. Thanks for any input, and I'll probably have more question's. Thanks

I'd give Nelson a call, with all your ?'s. With regards to the A/C wires, just don't use them.

I have been trying for a few day's, I guess they must be really busy.

Just a guess but maybe the white wire is for a tachometer. A/c stuff just don't use. I have a stock harness and just left all that stuff unplugged tucked away, no problems at all.

I did find out that the white connector is called C 152.

first question is the VSS sensor plug is different, can I solder on my original 95's pigtail to the new harness, and have it work?
yes, just swap yours over, pretty simple. it's just 2 wires.

also I guess there is not supposed to be anything hooked to the module on the side of the shift arm because that wiring has been removed.
take the nutt off and remove it, then put your shifter linkage back on it.

Second question for some reason they left all of the air compressor wiring in my harness, I thought it was supposed to be removed, because I would be using my 95 ac wiring, am I right or not?
why remove it if you are going to be running A/C? you should have the High pressure/Low pressure/Clutch wiring. that's the only ones i kept other than the one that plugs into the dryer by the fire wall.

Third question there is a large white connector about 12 inches from the main 2 computer plugs, I have no idea what this is for, or if it's needed.

the only white wire i had was for the Tach if i remember correctly, if not then i can go look.

anymore questions?

keniff, as far as your a/c wiring goes, are you using "just" the F-Body hi-pressure line sender/sensor, to control the a/c? Or both the original accumalator low-pressure switch "and" the F-body sender, combined? Or...just the accumalator switch alone? Thanks

your running your stock A/C right? just keep the wiring for it. the Fbody set up should be the same as my Truck set up.
if you need anything lemme know ill try an answer anything i can

your running your stock A/C right? just keep the wiring for it. the Fbody set up should be the same as my Truck set up.
if you need anything lemme know ill try an answer anything i can

If you want your IP cluster to show what gear you are selecting you need to wire the switch on the shift linkage back to it. On a 95 this is what tells it what to show. There is no mechanical pull like on the 94 and earlier.
Also I would think your Nelson harness should have a neutral safety switch wire for you to hook up. It needs to go to this as well.

my NP harness didnt have a wire for the safety switch.

So can you start the thing in any gear?

Nor does mine have the neutral safety switch wire, but I would like the gear indicator to work, so I think I will research the wire and use my original 95 wiring to hook that up as well as my ac, but my question is, how does the new computer see the ac request to increase idle speed?

The original setup on a 2003 is this. Your HVAC controller sends a serial signal to the PCM requesting AC clutch ON. If the PCM criteria are met, it will engage the clutch and compensate the idle based on tables it has stored for the TQ necessary to run the AC compressor.
None of which is really necessary. The PCM will automatically adjust the idle to make up for any extra load, no matter what it is from AC compressor or no.
Your original 95 system didn't run the AC request through the PCM and you won't need to on this one either.
The 2003 system is set up that way so the PCM can kick out the AC clutch at certain TPS % , you can't use this feature anyway since you won't have a serial based HVAC control unit.
If you had a 99-02 PCM you can make it work this way, because they didn' t use a serial based system. They used the same basic setup as your 95, but it did run through the PCM.

Really not worth worrying about. Just set it up like the 95 factory stuff was and it will work fine.