[ray_mcavoy]

So no needle movement at all regardless of what you do with the sense terminal, correct?

That might be due to a bad ground at the gauge.

It's been a while since I've had one apart, but if I remember correctly, there is a ground contact on the back of the gauge that has to make electrical contact with the cluster housing. So check that area of the housing to make sure it doesn't have any surface rust, paint, etc. that would prevent a good contact. Might also be worth checking the gauge itself (compare it to your old one if you still have it) to see if maybe the new one is made a little different and not allowing it's ground contact to make a good connection with the cluster housing.