[FWB]

ford used to put what they called a gauge cluster regulator in cars. basically it pulsed the electrical signal from the senders to eliminate erratic gauge movement. they were located near the gauge clusters of most cars. they are rather simple bi-metal type of unit.....get one from a 65 or 66 t-bird and wire it in. i use the t-bird for the example because i know they are a separate unit from the cluster and are probably available at a resto parts house.

i have the stewart warner gauge too, and mine moves all over the place. i just don't care, i'm too busy keeping the car on the road to notice it...lol

fred