I recently bought a 91 Supra Sunsport, and have a little problem I am trying to fix.

When the boat is run around 2000 rpm's everything appears fine, however when I raise the rpm's to around 2500-3000 rpms the following warning go off all at the same time!

Volt red light goes on with warnng sound
Oil red light goes on with warnng sound
Gas red light goes on with warnng sound

when I slow down the lights stay on, then I SPEED UP AGAIN , and the light go off?

I checked all guages and they appear correct :/ is there a error that make all three lights go off?

any ideas????