I had someone make me up a fitting that adapted the trimatic speedo cable end and removed the cable and put a threaded end on it so the T700 sender screwed straight on .... this works fine but it is very custom and the guy didn't want to make another one! so I started looking at other options, and I was told the VL dash has a speed sensor built into it which accepts a speedo drive cable ....
so I purchased a VL dash and pulled it apart, and got just the VL speedo unit out of it, and in fact if you want to you can even pull the dial and the odometer part off it so really all that is left is a speed sensor and some electronics along with the speedo cable plug on the back!
we then fitted this to a jaycar plastic box, which has the speedo plug sticking out the side and the 3 wires needed for the pulse.
there is a small jumper cable from the main VL dash PCB to the speedo module, you need to keep this as your header for connecting the wires. on this plug there is RED BLACK and YELLOW pins, the red connects to ignition power, black to ground and the yellow is the 4 pulse output to the computer which on a 808 computer is Brown/yellow PIN A10.
for the record there are blue, green & brown also coming out of the plug, these are labelled as 2 pulse outputs, not sure what they are for but we didn't use them.
I will try and get some pictures shortly of the setup and also once we work out the pulses per km will update .... although it is in a race car so 4.11 diff and such will mean its out compared to a streeter
it cost $50 for the dash, and the trimatic speedo cable we already had, so its a pretty cheap and easy way to get a speedo sensor on an early model car if you want to EFI it and that's the only stumbling block.
this would also means if you used an electronic speedo ie. autometer/VDO then it would accept this pulse as well!
Edit: Pics added!
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