Measuring engine RPM
I need to measure the RPM of my Tohatsu 9.8 so I can determine which propeller to fit when using it on my 2.85m SIB.
Tests on the water have proved inconclusive and I need to determine the RPM at WOT although Tohatsu have recommended the higher pitch prop on this small boat (9.5 as opposed to the 8.5 fitted as standard)
I can see the "Tinytach" at £65 or so, but as I will only really need it once, I wondered if anybody has tried the one from Hong Kong widely sold on ebay for under £10.
It only needs to work once....
Alternatively can somebody sell me a used Tinytach for a reasonable price, then I can sell it on when I've finished with it?