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The electronic ignition kits now available for the TR7 are basically designed for Lucas 22/25/45 or the earlier Delco type of distributor where a solid magnetic ring fits over the cam. But with the 7's distributor, 300 type, the advance weights are above the cam and therefore prevent the magnetic ring being fitted without strip down the distributor. It has to be fitted bottom end up. 

AccuSpark and Pertronix  are a popular fit, but do require the distributor stripping.

There were some TR7 kits that just senses the distributor cam lobes and lacks a magnetic ring or light chopper. For a number of reasons these proved to be unpopular so were discontinued. 

Dave

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22 hours ago, Propshaft said:

Thanks Dave. I think I am going to go down the luminition route 

I haven't heard of any problems with the luminition system on the TR7

Dave

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