Intellitronix Gauge Issues

[truckman72]

We purchased these gauges back in December to go with our 5.3L LS engine and we hooked them up. Once hooked them up, the speedometer constantly blinks in and out and the voltage shows 7 or less. We went back and forth emailing with the company to try and resolve the issue. Two weeks ago we sent them back in, "fixed the issue" and they mailed them back, yet the issues still persists. Any suggestions on what we might be doing wrong? We are about to the point of mailing them back and going with something else