In 1997 the EEC-V, 104pin computer, runs Fuel injection and Spark, spark module in inside computer, it doesn't run dash instruments or starter motor functions.
But it does interface with GEM(generic electronic module) which runs the interior electrics, wipers, lights, windows.
GEM is somewhat self contained not sure it needs computer hook up
You would need a carb and a vacuum advance distributor, with spark module and coil, to get rid of computer as far as engine wiring goes.
Duraspark distributor with HEI module is a good combo, and just needs 1 Key ON power wire, so very very simple hook up.
Computer also ran the 4R55E transmission, which transmission are you using now?
Automatics have an NSS(neutral safety switch) at the trans shift linkage, 5 or 6 wires, it pass the starter motor activation voltage from the ignition switch to the starter motor relay.
You will have to bypass the NSS for starter motor activation, just splice the correct wires together, this switch also activates reverse lights, they need to be hooked up to new trans reverse light switch.
Wiring colors for these changes are on the internet, NSS bypass for your year.
1997 used electronic speedometer, signal came from VSS(vehicle speed sensor) mounted in the speedometer cable hole in trans, uses a gear just like a speedo cable, a gear which you can change to get correct speed.
GEM could also be part of that speed system
Engine wiring just needs
temp sender, 1 wire
oil pressure sender, 1 wire
ignition power, 1 wire
Tach signal in 1997 comes from the computer, so not sure this can be changed just with wiring, Dakota Digital makes modules for speedometer and tach conversions
See them here:
http://www.dakotadigital.com/index.cfm/page/ptype=results/category_id=287/mode=cat/cat287.htm
Alternator wiring is a separate thing, no computer control and would need to be wired into existing system based on the kind of alternator it is.
Dash Volt meter is not part of the charging system it just reads voltage in the system.
Battery light circuit is part of the charging system, it turns alternator ON/OFF.
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