85mph Speedo Replacement

[panteradave]

Is it possible to replace an 85mph speedometer (on an '82) with an earlier 150mph version? Does a 150 speedo require some sort of drive speed corrector in order to show the proper speed or are the speedo internals preadjusted from the factory?

Thanks,

Newbie Dave

[daves79x]

The 150 will bolt right on, but you lose your rear shock low pressure warning light - if you knew you had one. Now the problem is finding a good 150 that matches your degree of fade.

Dave

[Larry Zimmer]

And, at a price less than a mortgage!

[smrcbx]

Is it possible to turn an 85mph speedo into a 150mph one. I've got a good working 85mph speedo which i would like to refurb and turn into a 150mph one using replacement decals, but the needle will obviously read incorrectly too high a speed. Is it possible to get anything to change the gear ratio inside the clocks or is it simply a case of getting my hands on a scrap/damaged 150mph clock and using that as a donor. I did read that a guy at randakks, pete, did a conversion on the 85mph to turn them into one to read 150mph. Don't know if this is still the case. I'd like to do it myself is possible

Thanks,
Shaun