140 mph speedo

[stykthyn]

I want to get white face guages for my car and the best looking ones onlty go up to 85 mph. is there a way I can calibrate to use the 140 speedo guages?

 

[Shawneebear93]

I believe you need to get the correct "tooth gear" or something to make the 140MPH speedometer work correctly. Use the search feature and I'm sure you'll find an answer.

 

[RustBucket]

There's no special calibration or gear needed. The speedo itself takes care of scaling.

Now you can't go sticking the 140mph white overlay on top of an 85mph speedo or vice versa. But, if you find a 140mph speedo, you can throw it in the dash with the fancy white face overlay and be happy.

 

[Shinlee]

^^^^

huh?

my speedo gauge is an 85 one, and i would kill to use the 140 gauge one, but i dont know how to convert the speedo to work right with the 140 gauge

( i dont wanna be going 85 and it be reading 140 )

 

[Shawneebear93]

There's no special calibration or gear needed. The speedo itself takes care of scaling.

 

[RustBucket]

Swap speedos and be done with it. It really is that simple.

 

[stykthyn]

yeah I was gonna swap the whole cluster out first. I just couldnt find a concrete answer. some pple told me yeah it would work, others said no it wouldnt.

 

[stykthyn]

( i dont wanna be going 85 and it be reading 140 )

that would be hilarious, then you could do 0-60 in about 6 sec instead of 10

 

[RustBucket]

Swapping the whole cluster out is where the problem is. If you just change the speedometer you'll be fine.

 

[Shinlee]

awesome, thanks alot for the info, im gonna go find me a gauge with 140 on it

 

[65ShelbyClone]

You just need a gage cluster out of an '87-93 5.0 Mustang. For the '84(?)-86 cars, the speedo already goes to 140, but the markings stop at 85.

 

[Shinlee]

alright, so plain and simple, pulling a gauge cluster out of a 87-93 5.0 and putting it in mine is ALL i have to do, what about the tach, will it read right? it only goes to 6k, and the 5.0 goes to 7k and all that junk

 

[Shinlee]

sry, last time i thought somehting was that simple i tried to swap an 89 a4ld tranny into my 92, and that really really wasnt cool, and i do not want something of that magnitude of a headache again

 

[stykthyn]

I think that we just need to pull the speedometer off of the cluster and install it in ours. at least that is what I can figure from this thread if I read it right

 

[RustBucket]

Well at least one of you has reading comprehension skills.

One more time.

Swapping the cluster is where you run into problems. Stop. End of sentence.

It's an in and out deal if you change the speedometer, only the speedometer, and nothing but the speedometer. Stop. End of sentence.

 

[65ShelbyClone]

alright, so plain and simple, pulling a gauge cluster out of a 87-93 5.0 and putting it in mine is ALL i have to do, what about the tach, will it read right? it only goes to 6k, and the 5.0 goes to 7k and all that junk

Oh crap! I made a mistake earlier. You need a speedo out of an '89-93 5.0 Mustang. I completely forgot that the '87-88s also had an 85mph speedometer.

Edit: Unless the '87-88 Mustang was a Special Service car(like Highway Patrol). They not only had a 140mph unit, but it was also calibrated. The officer could use the speedo reading as legal evidence.

 

[Shinlee]

awesome thanks alot....hooked on phonix learned me good

 

[RustBucket]

awesome thanks alot....hooked on phonix learned me good

Got the speedo swap done yet?

 

[Jquintel]

why dont you just find a set of white faced 85mph gage faces instead on ebay??

 

[stykthyn]

cause I regularly go faster than 85 on the interstate