Yes. See #10 that says
["they are using old rpm analog (or digital) display that produces full scale at 700Hz. so they want the multiplication precise x10 "]

So the output is a tacho, & all of those I know use pulse integration, so is somewhat burst tolerant.

Hence the simple UART approach, which emits 5 pulses per IP edge.

That meter integration means it will likely be enough to just emit at a fixed 1400 baud, or you could time between each edge, and adjust down the UART.

Code is very simple, as the uC needs to do nothing else
// Set BAUD to 1400
loop this forever...
WHILE Pin = LastValue DO
LastValue := Pin;
SBUF := 055H;
END;