Using stock gauges probably won't work, due to differences in resistance values/wiring between gauges and sensors on the new motor. Would probably have to go with after market gauges that are wired independently. The ECU is only really needed with fuel injection/emissions controls, so if you're swapping in a carburetted 350, you're not gonna be able to pass emissions, and therefore don't need to worry about controlling them.
Unless you want to do your part in protecting the planet.
Then you should get a POS Prius.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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