Technical Dolphin tachometer

I have an older set of Dolphin gauges with no instructions. I have got most of the gauges working correctly just can't figure out the tachometer. The back of the tachometer has 5 studs not sure of where to hook what any help would be appreciated thanks

 

Never heard of those before... Got pictures???
Post'em if ya got'em please...
Thanks!

 

This is the back of the tachometer

 

Hi, there is a guy on flea bay that sells those gauges & an his seller name is oldnewparts . you could try and get some paper work from him (instructions) hope this helps . also said he had a store. old new parts.

 

This is the face

 

Google Dolphin Tach installation instructions. Thats where the instructions are.

Gary

 

Salt water mammals should not be in the gauge business!
KK

 

Poor quality instruments...