I've had my knock gauge(casper's) for about a month now and I'm not sure if it's any good. For a while I was just having a problem with it reseting so I installed a on/off switch to the ground. It worked on occasion but now the standby light never comes on at all. It's usually yellow, sometimes other colors but never the standby light. Anybody experianced anything similar? Should I just send it back or what?