Cable driven speedo, so no sensor. There is a 3 piece cable running from the right side of the transmission up to the gauge cluster. The "pigtail" looking portion of the cable (on the transmission) is known to break somewhat easily, so that may be a place to start looking. Also, in my personal experience, it has been somewhat difficult sometimes to align and properly seat the speedo cable with the back of the speedometer. Might not be making the connection there.
BTW, I can tell you that you won't find anyone in Billings MT that can do any tuning on anything but a diesel truck. Everything people seem to drive here is diesel or an American V8 of some sort.
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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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