Help RPM gauge not working

[marco321]

well lads

i recently changed my engine as i had some issues with my old b18, so i put another b18 engine in the car and my rpm gauge isn't working, everything works bar that i have vtec,speedo,temp, all dash lights, just no rpm

i used my old engine loom and old dizzy, i changed the ecu, but i have tried 3 different p30's and still no joy
could anybody help me out thanks

 

[RyanSi]

Broken wire possibly? I'm sure it's the dizzy that sends the signal for engine speed so maybe a break in a wire between the dizzy and ecu?