I have a 77 280z with a factory rebuilt motor. I got a free unichip to put on my car. I found the pinout below searching through the forum. I just wanted to make sure this is the correct pinout for my 280z L28.
The Unichip Q is basically a piggy back computer. It allows you to retain the factory ECU yet go to larger injectors and pull back the pulse width (You can't really add pulse width. Most applications you go to a larger injector and pull out injector open times to achieve the proper Air Fuel ratio). It can also do timing control, but I'm not sure how much I can do with my distributor.
I will be pulling the factory mass air flow sensor and going to a MAF out of a Subaru impreza (have one lying around so its free to me). Also, I have to add a air temp sensor. I'm going to use my Innovate LC1 to tune it
http://www.unichip.us/unichip_features.asp
Here's the pinout/color/purpose in a 280z.
1/B/Coil (actually goes to the 4-pin connector, more on that later)
2/B/TPS #2
3/B/TPS #3
4/G/Start signal to stock ECU not used in Megasquirt
5/B/ Ground
6/B/ AFM #6
7/B/AFM potentiometer
8/B/AFM
9/B/AFM
10/L/Switched 12VDC from ignition relay...more on this cluster later
11/not used
12/B/to altitude switch-not used in megasquirt
13/B/H20 temperature sensor signal...2500 ohms at 80 deg F
14/B/Injector #4 switching pulse
15/B/Injector #1
16/L/GROUND..has a bit of yellow paint on the end
17/L/GROUND..has a bit of WHITE paint on the end
18/B/TPS middle wire (I put this to ground on MS-II)
19-not used
20-not used
21-G/Cold start injector 12VDC comes from 4-pin connector Can be reutilized as in my install
22-not used
23 thru 26 also not used
27/B/AFM
28 and 29 not used
30/B/Injector #5
31/B/Injector #6
32/B/Injector #3
33/B/Injector #2
34/G/Air regulator 12VDC lead I reutilized this (without the 12VDC naturally)
35/L/ GROUND..has a red mark on the end by the "DB-35"(datsun-bullcrap 35pin) connector