Tach to adjust rpm

[79fordblake]

Anybody now where I can get a fairly cheap but accurate tach so I can check the idle rpm on my 185s? The reason for wanting to make sure idle rpm is correct is so I can check the timing.

I have an 8 cylinder clip on style(its a tach and dwell meter), is there some formula I can use to make it read for a 1 cylinder? Thanks.

[rdlsz24]

I got one of those Tiny Tachs and I can use it on all single cylinder engines to check rpms. It was around $50 I think. I originally was trying to find an old bike tach but even beat up ones on eBay went for $20+, and I wasn't sure they would even work.

Rob

[harryredtrike]

do it by ear.if you put it in gear and it moves without the throttle than idle is to high.if it stalls than its to low.or have a friend count the revolutions of the motor while the pull start is off.