New gauges with issues

[bighead]

I installed new Stewart Warner gauges into my 65 Mustang. It has a Painless Wiring harness and the proper Stewart Warner sending units for the Temp and oil gauge. My problem is that these gauges do not show a steady reading. They bounce back and forth like they are not getting a constant current or something. I ensure that they are grounded correctly but the needle on both just bounce back and forth. My electric, tach and speedo work great.

I am at a loss. Any suggestions?

[newvintageusa]

Yes, that sounds like an intermittent signal. Another thing that screws thing up is dash mopunted speakers and sometimes RF interference
Mark

[bighead]

Yes, that sounds like an intermittent signal. Another thing that screws thing up is dash mopunted speakers and sometimes RF interference
Mark

Thanks for the input. I don't have a stereo in the car so don't think thats it.

[ProdigyCustoms]

MSD not inside the car is it? The EMI from those things is incredible

[dhutton]

Is your engine block properly grounded? Same question for the body and frame.

[bighead]

I got them working! Thanks for the help

[Twentyover]

How did you resolve the problem?