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MG MGB Technical - speedomerama

OK, I've decided to solve my speedometer error by purchasing a 1280 tpm speedo from the U.K. (Trying to keep it simple so I thought.)

Paul Hunt's website has an excellent speedometer matrix showing part numbers and their corresponding tpm.

I've found two 1280 tpm speedo sources however they offer two different part numbers BHA5281 6144/23BS and BHA4707 6144/20. I believe that these are both the large faced speedos.

Paul's chart says that the BHA4707 is for a standard transmission and the BHA5281 is for an overdrive.

If both are 1280 tpm what is the difference between these two speedos?

Steven Rechter

This thread was discussed on 16/07/2012

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.