Tach Setting

[ropatz]

Could someone look to see what the tach settings are for a F150 on the SL190. For some reason mine is reading about 1000 RPMs too high.

[PSM207]

I doubt that the tach setting has changed, but it is worth a look. I've seen tachs vary, including mine. I believe your F150 manual has the tach settings.

[PSM207]

I'm incorrect, the manual does not list the settings for the analog tach.

[mark Z21]

there is a tini hole at the top of the tach (back side) insert a presision flat blade screw driver into it and adjust, get a tinytach.com unit for 35 bucks dial it in, my tach was off about 600 rpm

[deer0373]

Sorry to hijack, but where do you clip the tiny tach on the motor? Spark plug wire???

[PSM207]

According to the website you wrap a small coaxial wire from the tinytach around a spark plug wire.

[ropatz]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mark sl210 &raquo;</TD></TR><TR><TD CLASS="quote">there is a tini hole at the top of the tach (back side) insert a presision flat blade screw driver into it and adjust, get a tinytach.com unit for 35 bucks dial it in, my tach was off about 600 rpm</TD></TR></TABLE>

I like the tiny tach idea, but I have an oscilloscope on hand. Next time I take it out on the water I'll wrap a wire around a spark plug wire and take a frequency reading with it, and adjust the tach accordingly.

Thank you,

Ryan

[PSM207]

The F150 has 2 coils, which fire on 2 cylinders simultaneously. One of the cylinders is at TDC compression, while the other is BDC exhaust. You'll have twice as many pulses due to this, so calculate rpm accordingly.