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Interchangeability of Speedos and Tachometers within CB750 models

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Pedro26:
Hi,

Can anyone let me know if the speedometers and tachometers are interchangeable between the CB750 models?

Background I have a USA spec 1975 CB750F supersport (bought from AP motorcycles in Matlock). I did the main mechanical restoration work back in 1998. At that time David Silver spares used to stock both the original and pattern versions of them. The genuine speedo was £95.00 and the genuine tachometers US style was £69.00. Replica ones were less than half that. I’d planned to do this more comestic finishing work at a later date. I thought I might run to the genuine ones eventually. In 2002 the bike was stored, and it’s only now that I’m finally able to do that work.

However, now David Silvers  can only source new genuine speedometer for my model and it’s now over £500. I can’t justify spending that on a Speedo. However I’ve seen new speedos and tachometers replicas for the 750k series SOHC Hondas at sub £100 prices. They look ok and are only missing the ND logo.

I’ve seen other people open the originals up, and service them, putting a transfer on the face, but the  face of my Speedo dial has puckered away almost like it’s been heated in an accident. Also the crimped on chrome ring is difficult to remove and replace well. Not impossible to physically do with patience, care, improvised tools, a jig and tube clamp. (A Dutch guy seemed to have a better smooth pipe clamp than the normal jubilee clamp.)

Anyway, I thought put on the pattern ones if compatible and save the originals for the bike’s future owners. That is if they fit etc.

I hope somebody on here can advise.

Thanks in advance.

Deano400:
I don't know about the interchangeability of the clocks but Peter Horton, Kent400 on here, is the man for clocks. Having done a set myself I decided once was enough and sent the next two sets to Peter, came back like new.

McCabe-Thiele (Ted):
Peter Horton has done my 400 & 500 clocks very happy with the results.

Sesman:
Peter is the ‘Boss’. Had two sets done 👍👍

Oddjob:
100% agree with above comments. Peter has boxes of broken speedo/tachos, so even if your facia is unsalvageable it's possible that Peter will have something he can use as a replacement. Superb work, and if you knew me you'd know just how good that it coming from me, he'll take it apart, re-zinc the base (which may look ok from the outside but be rusty as hell on the inside) fill the damper pot to stop the needle bouncing, repaint the needle and reface the facia. He'll also respray the outer dish, comes back as good as new. He has a special machine for recrimping the ring. And the cost is usually less than DS wanted originally for a genuine one.

The only down side is how busy Peter is, might be a few weeks before he an return it, won't know without asking.

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