North American Turbocoupe Organization



140mph Speedometer
Viper7 Offline
Member
#1
I recently purchased a 140 mph speedometer. Are these just plug n play or is there a conversion process I'll need to do to install it? Any help is appreciated
Viper
88 TC Project Car|Deep Ocean Blue Metallic|Marchal Fog Lights|Custom Interior|Custom Instrument Panel|Gillis Valve|Cone Air Filter

Shine she may, Run she must
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Pete D Offline
Administrator
#2
P&P
Pete Dunham


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Jeff K Offline
Administrator
#3
P&P as Pete said. If you dont mind taking it apart, you can easily reset the odometer to match the correct miles on your car.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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k98311 Offline
Member
#4
Where do you get the 140 speedos?
1986 gold TC 5 speed 100000 miles turbo muffler cat delete
Sounds like a turbo diesel people say
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Pete D Offline
Administrator
#5
Ebay, they are obsolete from Ford Motorsports. Rarely one can be found in a JY gauge cluster. They were a Motorsports item.
Pete Dunham


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RDOG Offline
Posting Freak
#6
You can buy an overlay, and there is a link on c ougarnuts, that shows ypu how to add a diode to recalibrate the speedo to work with the new face. Its not super accurate, but close enough
1986 Turbo Coupe. Boport StageIII head, Boport 2.1, Performance Techniques 50 trim hybird, StageII.63, stinger 3" exhaust, Phenolic spacer, Boglog header,NPR FMIC intercooler setup, kirban fpr, bigrmotorsports fuel rail, diablo water meth kit, CAI, remote mount TFI, CHE rear adj control arms, MAC girdle, 8.8 rear disc, aluminum drive shaft, H&R lowerings springs Tbird Turbo Specific, y MAS!!
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Jeff K Offline
Administrator
#7
Its a capacitor you change on the circuit board, not a diode. They can be calibrated to be very accurate (+/- 1 to 2 mph) if you know what you are doing.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Tbird-fanatic Offline
Senior Member
#8
Do we have anyone that is willing to modify one on here? and get it that accurate? I want to do one but don't have the stuff out the best soldering talent.
1988 Tbird TC - in pieces - barn find - mods beginning while restoring
2000 F250SD XLT CCSB 7.3 Powerstoke - Daily Driver - AFE intake, Swamps tunes, straight piped
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Jeff K Offline
Administrator
#9
The electrical mod is very simple. You just replace one capacitor with another. The cap is very easy to get to at the edge of the circuit board. The art comes in replacing the face and playing with the calibration weights in the meter movement. It is very time consuming and delicate work, and requires electrical test equipment (a calibrated signal generator). I used to do these for people several years ago, but dont really have the time these days.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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