Ok, I've recently had this done to the EL XR8, and can add a couple of things for the EL 8's.
The below assumes that you've changed to a manual ECU (I had to - the auto ecu freaked out when it realised the Auto computer and box was missing. Among other things it ran the thermos at full speed all the time. It seems like
http://www.autoemf.com.au/ is a good source for cheap ($350) ECU's - easier than searching wreckers).
In the EL's, if you run a Manual ECU, it does actually accept inputs from the clutch - its actually drawn as a parallel circuit, with neutral switch and clutch switch in parallel - so either one being triggerred (i.e. clutch in, or in neutral) will tell the ECU its in neutral (although what end effect this has /difference it makes, I'm uncertain)
Also, the inhibitor switch is ideally shorted, rather than connected to the neutral switch on the gearbox. In the Manual loom, the inhibitor switch does not exist. (same pins are used in common parts of the loom). I've shorted it, but am thinking I might incorporate it into a kill switch system (thieves are unlikely to suspect an auto loom in a manual eh?

).
Finally, you should connect the neutral switch on the box to what was the gear select connector on the auto loom (one of the connectors that was hooked up to the gear position sensor on the side of the auto box). These pins *are* still used by the manual computer (equates to the neutral switch connector in manual loom).
I originally had the neutral switch on the inhibitor connector, and the gear position connector disconnected (open circuit). This meant that the car wouldn't start unless in neutral, but run ok otherwise. The problem I discovered was that this freaked out the diagnostics on the car, and you *cannot* get the car into KOER diagnostics (i.e. cannot set base timing accurately), and KOEO diags will only yield 522 ("Gear lever needs to be in P or R for KOEO test"). This is basically caused by the gear position connector being open circuit - which the ECU equates to being in gear. Equally, you could probably short this connector (and have it think it permanently in neutral), but I'm unsure of any side effects of this - and at the end of the day, you have the inputs / outputs free, you might as well use them !
Hopefully this makes some sort of sense . . .