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Message: <blockquote data-quote="Rednaxs60" data-source="post: 231665" data-attributes="member: 4617">You are correct regarding the crank trigger wheel.  You can use a crank trigger wheel with a missing tooth in the dual wheel mode, just means there will be a very slight interuprtsion in the crank signal to the ECU.  I chose to add a tooth in the missing tooth spot just because.  The camshaft signal is for the engine cycle.  My CFI system is operating in the dual wheel mode with crank and camshaft signals to the ECU.  Need this because the engine has sequential fuel and ignition.  I have installed the 36 tooth trigger wheel so pics are a no go.  The picture in post #17 should be self-explanatory, drill the centre hole the size of the crankshaft and then notch for a small key.  You have to make the decision how you intend to install EFI conversion.  The use of a camshaft sensor orients the ECU such that the ECU knows where the cylinder TDCs are.  The ECU is "guesstimating" where #1 TDC and other TDCs are if not using a camshaft sensor.  Installing a camshaft sensor at the start "future proofs" the EFI instal.</blockquote>