SR in my R33. Trying to get tachometer working with no luck. Norfy? Lol

Hey guys.

My sr33 is putting big smiles on my face. But I'm having some issues with my tachometer.

I know it's wired up right to the ECU. I've continuity checked form pin 7 on the SR ECU plug to the blue and yellow wire on the clock pack plug of the r33 (which I'm fairly sure is tachometer)

However all I get is the needle moving a bit between around 1k rpm and 1200. So basically it's doing sod all.

Now putting an RB in a s14 you'd need a resistor so the 4 pot clocks can read the 6 cylinder signal.

What do I need to do? Ideas on a postcard :)

Cheers!!!