Speedometer Cable Digital Adapters

[HAIDI22]

Hi,
I'm looking for a speedometer cable digital adapter for my injection project.
Is there an easy way, plug and play or must I buy a universal upgrade kit. Has someone done this before, I cannot find in the forum anything about digital speedometer upgrade.
What is the size of the thread of the cable?
Christian

[Beans]

Some Rover SD1 models came with an electr(on)ic pick up from the gear box.
Might be a starting point?

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<font color="blue"><i>1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
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[DNK]

Any chance this is Mad Marx?

Don
Stick a Wedge In It
80 TR7 V8 Kick in the pants