Not every turbo had a MA71 VIN code, I've had a factory turbo with a MA70 VIN. There is a plate under the hood on the firewall on the drivers' side. This gives you some key codes, such as what engine, transmission, and differential came in the car (see this link here). If this is a factory turbo car, it should say 7MGTE for the engine, and then either R154 (standard) or A340E (automatic) for the transmission. Hope this gets you going, and good luck with the car
Oh yeah, the boost gauge is on the right of the gauge cluster, next to oil pressure and fuel
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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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