Tacho Gauge not working

[MA70AEROTOP]

Hello guys ive got a wierd issue!!

My Jza70 tacho guage doesnt work! everything else works. ive run a wire stright from the ignitor to the plug at the dash and no change it doesnt even budge also tried another dash and that didnt work! is there any dash wires like earths or relays that control it have searched tsrm but no luck

 

[92TealSupra]

Wren Id id a guys swap there was two wires I used to make it work. Ign, and the other was the dash Taco.. you did both yes?

 

[MA70AEROTOP]

this is in a right hand drive supra using the complete JZA70 looms from rear to end. also another thing I noticed the Blue/yellow wire which carries 12 volts batt for the radio is not working to!!! ARGHHH

 

[MA70AEROTOP]

ok this is still an issue! ive checked continuity from check connector to dash loom plugs and continuity is confirmed! ive also swapped in my jza70 factory digital dash loom and it also has no tacho!! mind you car drives fine!! what else could it be any relays? ive swapped quite a few relays and no change also