06 infiniti g35 coupe alarm wiring issue

are there any options inside the cabin for the hood pin and tach sense?

Are these two even required to get the RS to work?

Thanks for the feedback!

Is the tach for the "anti-grind" feature? As long as there's a tach "on" signal going to the RS, it knows not to let another "start" signal try to trigger it? I want to make sure I understand that. What is the RS looking for as far as the tach signal goes? Would any "on/positive" signal work? Say the Accessory? The accessory signal is powered when the car is on, right? Or is that not how it works? 

As for the hood pin, I can switch off the "Neutral Safety" switch when dropping the car off for service, yes? But I guess you're right, it is safer with the hood pin signal connected. I've got to run the siren wire thru the firewall anyway, might as well bring the hoodpin wire along with it. Anything else that needs to go into the engine bay?

Thanks, again!

Duh, no, that won't work. The accessory comes on even before the engine cranks. Nevermind that part.

The anti grind feature works by energizing the ground when armed wire while the vehicle is remote started.  This will effectively activate the starter kill and prevent the key from cranking the car WHILE the remote start is active.

A tach signal is typically a digital on/off signal with a frequency related to engine speed (ie a fuel injector pulses every other motor revolution).  Basically, with this signal, the remote start can calculate how fast the motor is spinning.

I would hook the hood pin up.  Like you said, just run the wire with the siren wire.