Cheers Lads, the one on the manifold is connected to the brake servo, so I dont particularly want to T this one.

I'm not trying to tune them, They're balanced already, I'm trying to find out why there was no reading!

I've been told that all 4 vac's need to be connected together and then to the dizzy, otherwise whatever is connected directly to one port will only pulse for a quarter of a cycle, which makes sense.

I will ask tho killerscum01 mate if you could describe how to tune them!

Cheers

Lee