It's really not too bad, and I'd say if you go with the pre-built boxes it's only on the moderate harness for install. you don't need a sfmu, will need a rrfpr. On the easy side, you can tap new CLT and MAT sensors for the MS, and just tap your TPS and CrankPS. Wire up a few relays, make sure you have good grounds, and that's the install. It's up to you to re-wire the fuel pump or not, but it'll do fine with the stock ECU running it yet. It's advised to run a wideband into the MS, makes stuff MUCH easier. Other than that, it's all about gettin you maps tweaked to match your set-up, and there's tons of base maps/settings you can get to start from. www.msextra is very helpful if you need any help beyond your reach. For our cars, it's best to run MS1 V3.0. MS2 (last I heard) doesn't cope well with our ignition system, but can be used for fuel-only installs.

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'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi