Tom,
I know you already have money invested in your talking wattmeter, but
the LDG TW-1 has 2 different tuning tones. Hit a button and tone will
decrease as swr goes down. When you get to a flat, low pitch, it is 1.0
swr. Using the other tone for power yu can tune to increase the pitch ,
higher the pitch, the more power out. Runs off 12 vdc and has built in
speaker. It has made tuning my Palstar manual tuner a breeze. Perhaps
it would work in your situation.
73 Steve, KW3A