RPM & Gas gauge

[tuccimf1]

Trying to figure out how to get my gas gauge working on my 1989 Sports Fisherman boat with a 1990 Yamaha 150hp it's not registering the fuel in the tank and how to hook up an RPM gauge

[DennisG01]

Fuel gauge... most common thing is a failed sender, but the gauge and the wiring also needs to be checked. Verify the ground at the tank/sender is good. With the ignition on, short the pink wire at the sender.to ground - if the gauge moves to full with it grounded and empty with it not, the wiring and the gauge are fine, which means the culprit is the sender. If nothing happens, short the pinka nd ground at the gauge - which will then tell you if the gauge or the wiring is bad.

Not sure on the RPM gauge.