How to install oil pressure monitor

[gpag]

this question is relagted gto a thread I just posted about blue smoke from my 2003 Yamaha 200hp OX66.
There is no oil pressre gauge installed but I'd like to be able to monitor oil pressure. Specifically, I have my Garmin EchoMap hooked up to an NMEA network. When I look at the gauges screen there is an oil pressure gauge but it does not have any input. Is it possible to install an oil pressure sensor that would connect to my NMEA network and send data to the Garmin? If not, is it possible to install an analog sensor and gauge?

Thanks

[Simple Man]

I've never seen or heard of an oil pressure gauge on a two cycle.