Galaxy 959 Testing TP3 for AM, LSB, USB with FC-347 or what other freq. counter can be used for this?

I recently performed the clarifier opening mod on my cb. Then next step is to use an external frequency counter on test point 3 while on channel 1, & adjust L20-22 accordingly to get 16.26750MHz +/- 20Hz on AM, USB, & LSB modes. I bought the FC-347 and was wondering if there is a way to convert it into a probe for testing TP3. I already know about the less accurate test of using channel 20, removing the bias jumper board from TP 7-9, and adjusting the same inductors for a 27.205 MHz reading on the built in freq. counter. I also know that there is the FC 30BT freq. counter that has a probe option, but it's advertised as a transmit read only via the probe (which I guess might be fine considering I opened the clarifier; unless TP 3 doesn't work that way) it also has the limit of 0-1 V, I believe, & I'm not certain if TP 3 is with in those limits. By looking at the schematics, it would appear that TP 3 is nothing more than reading the induced frequency that the IC VCO block sends across L15, unless I'm interpreting it wrong. In short, I'd like to know how to test TP3 for AM, LSB & USB with either the FC 347 that I already have, or what external frequency counter can test this TP as described above.