Right i need to either find a very small act sensor ie about a 6-8mm thread size that will operate at 29ohms , 12v.

or

can I run an XR3i 8v EFI ecu without the sensor plugged in without it fucking everything up ?

Reason im asking is that im doing a very basic, budget zetec on bike t/b's and running with the 3i ecu etc for now and i dont have anywhere large enough to tap in the original ford sensor

This is the only problem ive got left to sort now, well apart from the engine mount, exhaust etc etc