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Old 07-19-2011, 08:27 AM
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Kinky speedometer

I have a 40 ford original, housing and cable. I have a 2:73 rear, TH400 and 500 cadillac. I tried to see if it would get to 100 mph, (original speedometer). I forgot how that car will go to 120, maybe more.
What happened, maybe when it got to 100 the cable broke. Is in this modified day, is there electrical speedometers, with sonic age. I want to calibrate the speedometer to look forty to 120 mph or more. I am a Illustrator to change the mph. Just to know how fast I when I pass the State Troopers and not get a ticket. I would not do that anyway!
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Old 07-19-2011, 05:05 PM
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If I understand you correctly, you want your speedometer to read 40 when you're going 120, then you would repaint the face and make something like a 240 mph speedometer out of an original gauge?

Here are a couple of ideas...

These inline gearboxes come in various ratios up to 2:1 (50% reduction). You would have to stack two together to get the 3:1 you're looking for (a 50% reducer and a 26.7% reducer stacked together would make 120 MPH register as about 44).

(click for link)


Or, for four times the money, you could install an electronic speed sensor on the transmission and run one of these electronic to mechanical speedometer drivers:

(click for link)


Hope this helps.....
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Old 07-19-2011, 05:53 PM
Footstomper
 

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Joe G.

It looks great, have you using it? It is electrical without the cable? Just three wires. I put on my favorites. Thanks Joe.

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Old 07-19-2011, 09:15 PM
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I have used the inline gearboxes (top picture) before. Bought them at my local speedometer shop.

Haven't used one of the Cable-X systems (bottom picture) yet, but I plan to on an upcoming project. The black box mounts inside the car and has an electric motor that drives a short speedo cable that goes up to the speedometer. It is wired to an electronic speed sensor on the transmission. They work great for situations where you have a old stock speedometer and a modern transmission without a mechanical speedometer drive. The down side is they're $400

Another thing to consider - If you re-number the speedometer face like you are saying, the odometer will read wrong (drive 100 miles and it will say you only drove 33); there's nothing you can do to correct that.

Good Luck...
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