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.
2008 GMC CCSB 6.2/6L80e swap
Gen IV 5.3/60e swap 1994 ecsb W/T
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.
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