Check Handi-hams. I think they still have a tuning aid which is similar to the Conway Tuning Aid which is a VCO you hook across your meter. If your rig has a built-in meter with SWR, you can hook it there and get readings on your drive level, etc. If you have an amp, you'd probably want to install a quarter-inch stereo jack across that meter so you can hook the tuning aid up to it. Steve K8sp