another thing to think about is once you buy the PSI harness, ECM, and pay for your tuner to do his thing.... Let's say the total is $1300.... And if you buy HP Tuners to tune/data log that is another $550+
You aren't very far away from buying a Holley HP, Megasquirt MS3Pro, or similar aftermarket EFI which has data logging, traction control, 2 step launch, automatic fuel compensation (add in up to 100% more fuel if needed), FlexFuel, multiple maps to choose from, etc. They include new harness and ECM for around $1800-2000.
The new MS3Pro Ultimate is about the same cost as the Holley HP and does what the Dominator unit allows at the HP price point. 100% made in the USA with lifetime warranty too.
I run the Holley HP in my road race RX-7 (LS7) and the Dominator in my LS9 turbo RX-7 (6.2 based LS9) and if the MS3Pro Ultimate was out when I built my cars... I would've run that.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
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