Need a little help here. I have a tach and dwell but no clue where to connect it. 2 leads on it old school type. And what rpm is it meant to idle at?


85 F-150 with the 300 4wd 4spd. CARB is not original. Sticker under the hood says you can't adjust it but you can so I don't think it's original.

 

There should be 3 leads two with alligator style clips (one red and one black booted) the third wire should connect around the number 1 plug wire. Your RPM information (what RPM curbside [neutral with parking break set or wheels chocked with manual, or in park for automatic, transmission] example: 800RPM with vacuum disconnect from the distributor and hose plugged) should be on your emissions sticker near the radiator

 

There is just red and black clips no third wire?

 

Which tach/dwell meter do you have?

 

Dixco Tach and Dwell.

 

I do not think that one will work with your truck unless you have changed it back to a points system. That one connects to the +(red) and -(black) sides of the coil.

 

Most I see for sale for only 2 wires? The ignition coil?

 

Dwell is points - a dwell meter is useless to you. for the tach - no instructions ? One side will go to the coil - are you just using it to set your idle speed ? Just set it to the lowest idle it will stay running well at.
That's all I'd do anyway.

 

This dwell/tach Connects on the + and - connections on the coil to get power and give readings. It detect the break of the points opening and closing

 

I know I can't use the dwell function just the tach function. What coil? Also the choke won't set half the time? Any ideas on that?