Almost a year since i managed to fit a digital speedo unit into the 7 dial dash , i have now managed to rig up the sensor (hopefully correct this time).
I did place the sensor on the n/s rear wheel hub - but under cornering the plate (cog) which was about 11" in diameter and sandwiched between the wheel and hub , was flexing and hitting the sensor (not good for longevity of the poor sensor !
Now made a smaller cog which is sandwiched in place between the prop and pinion shaft - then made a bracket and welded in place on the axle to accept the sensor - this was quite tricky as the distance between sensor and the cog must be no more than 2 mm - although the sensor can be adjusted , i deceded to get it as close as possible with the bracket , then fine adjust the sensor ( has 2 nuts on a thread) . Rather than overtighten and snap the sensor (as i did with the 1st one
) i used epoxy resin around each end to stop the nuts working loose.
The sensor cog looked a bit exposed to any thing that might be sticking up in the road so i made a guard plate out of 3mm thick stainless steel plate then welded some brackets to the underside of the diff so it could be bolted in position and easily removed if need be.
It looks a bit of an overkill , but i dont want anything fouling that spinning cog and messing up the sensor .
All wired up - tried it out on axle stands - in gears , it works - only problem is when the ignition is swithed on the speedo needle jumps up to 30mph (car not moving) - so had to strip out the dash to get the speedo out and remove the needle - refitted and wound back to zero , problem solved
With the dash out , it was a good idea to road test and calibrate the unit - theres a sensitivity adjuster at the back of the unit which is a bugger to get at when all the dash is in place .
A few test runs and constant stopping to adjust it , soon had it almost synchonised with the speed on the satnav .
Best i could get was - Sat nav 28 - unit 30 , sat nav 59 unit 60 sat nav 71 unit 70 , so thats close enough for me
[Hosted_Picture]
[/Hosted_Picture]
[Hosted_Picture]
[/Hosted_Picture]
[Hosted_Picture]
[/Hosted_Picture]
[Hosted_Picture]
[/Hosted_Picture]