Trying to figure out if my idle is right on a 98 FLHTCI. Thanks.
-Matt

 

Not without an adapter that reads induction from a sparkplug lead and plugs into the multimeter. SnapOn has them but not cheap. Not sure about other brands.
Ron

 

The ECM doesn't send a signal for the tach? I using a drivetrain out of a wrecked 98 bagger and stock EFI harness...I only hookedup the wiresthat I needed but thought that one of the ones that I didn't use might be going to the tach. Their wasn't much interconnection between the EFI harness and the main harness but their are I think 3 or 4 wires that I have capped, thought maybe one off these would be going to a tach...

 

If one of those unused wires is a tach signal, it's going to be a pulse train signal not an analog signal. If your multimeter has a frequency range, you can measure it...an AC or DC voltage range won't work.

 

This the the meter I have:
http://www.sears.com/shc/s/p_10153_1...rms+multimeter
It has a frequency range so I am guessing it would work...?

How would I find out what reading is what rpm?

 

That metercan dofrequency, so it should work. Page 20 of the owners manual tells you how to do frequency measurement (ignore the % duty cycle stuff). I would set the meter on the 50Hz range for checking idle rpm. The meter will read in Hz (pulses per second), so just multiply by 60 to get pulses per minute or rpm. 16.67Hz would be 1000 rpm.

 

Awesome man...I really appreciate the help.
-Matt