SOHC.co.uk Forums > CB750

Electronic Speedo's

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philward:
I'm just about to look at the double disc conversion mods for my road based cr750 build and as I'm using the proper cr750 dash (and not the standard speedo/tacho) - but will obviously need speedo. Has anybody any experience on these setup and basically tell me how they work. Any specific experience on the 750? If I go the electronic route, I can adapt the twin disc without adapting/changing the speedo drive
Thanks
Phil

royhall:
There are basically two types of electronic speedo, one that has a sensor to measure wheel speed, the other a GPS unit. The GPS type are easier and neater to fit as they dont need the sensor and cables, just a power supply. Unfortunately they tend to be dearer. Try this site for some ideas:  http://www.digital-speedos.co.uk/

philward:
Thanks Roy - had a quick look and will probably go for a GPS version
Phil

gtmdriver:
I'm not sure about the legality of a GPS based speedo in the UK.

They certainly aren't allowed in the IVA test for cars as they don't work when you're in a tunnel and such like.

I doubt if the average MOT tester will pick it up but you never know.

As regards the sensor type you just need you mount the sensor somewhere where it can detect a rotating part. I've got one on my car and it detects the 6 bolts on the drive shaft flange.

Programming is easy. All the speedo needs to know is how many pulses it will get from the sensor per wheel revolution and how far the vehicle travels during 1 complete wheel revolution.

Rob.b (Rob Birkett - RIP):
Phil,

You probably already know this, but just in case you don't there are free GPS speedo apps for your phone.  Mine even has a trip computer included and is very customise-able 

Rob

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