force rpm guage

[Gerard1970]

Just wondering if an automotive rpm gauge will work for a prop trial. My rpm gauge is no good and looking for an alternative till I get a new one. Thanks .

 

[Jiggz]

Most likely not unless it is a magnetic or induction type. Try Tiny Tach, it's an induction type tach.

 

[Gerard1970]

Just picked up a teleflex gauge for the boat....hoping to get it on today.

 

[stubtail]

Be mindful that some automotive tachs have a selectable switch on the back to condition the input for the correct indication with regards to the number of cylinders, and this is based on a four stroke engine, not two. If set for a four cylinder, your reading would likely be twice the actual until the instrument was set for an eight cylinder.