Winter Restoration

[1988comp]

This winter I am putting a Chevy LS-1 in my boat. It comes with a harness for just about everything to do with the engine.

I bought some new gauges, like thise that come on the new Supra boats (or maybe a few years old) and the speedometers are considerably different than what I have seen in the past.

They do not accept an air hose, they have electronic input, and I was curious what feeds them?

[jclose8]

Those gauges are made by a company called "Medallion." All of the gauges are controlled by what Medallion calls an "MDC" which stands for marine data concentrator. The MDC has two hose barbs on it which accept the pitot tubes. The box measures the air pressure and sends an electronic signal to the speedos.
This is a pretty involved set of gauges...... You may want to contact medallion and see if you can get your hands on a wiring diagram.