Engine instrument Changover control

[blottom]

I have a 79 33 foot catlina wi

I have a 79 33 foot catlina with sedan bridge:
It has an engine instrument changeover control. I cant seem to find any info on this anywhere is anyone familiar with this. Mine does not appear to be working and i need to figure out a fix.

thanks

 

[sandkicker]

"I could be as simple as a dou

"I could be as simple as a double pole two position switch which controls which set of instruments gets 12 volts fed to it and which tach gets the pulses from the coil. If the boat has twin engines, add another pole to the switch."

 

[blottom]

Thanks for your response

Thanks for your response