Hello, the topic has to roll up again, unfortunately nobody has been able to help me yet… So let’s ask a general question: Can I attach any rev meter where 8 cylinders is capable to my small block with HEI distributor `????? I ask the question because I bought a closing angle meter ..with which you can also measure speed and this part could not show any speed to my small block….but the part went to my 2nd car Ibiza without problems ..!!! what does that mean now ?? H EI distributor broken or you need special DZM ????? Thank you for your help MFg achim