Tach on new distributorless ignitions?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**'70_402** · 02-10-2005, 06:38 PM

How do you hook up a tach on a distributorless ingnition motor.....got a sand rail with a 98 ford 4 cylinder in it and was wondering how i hook up a tach...no distributor??? anyone done this??

Thanks

Rick

redz 1970 K5 · 02-10-2005, 07:09 PM

You can use a magnetic pickup. Not sure of the implications, but I know this pickup can be used for the tach signal. Think it measures crank rotation by the harmonic balancer somewhere.

Eddie H. · 02-10-2005, 09:42 PM

The Ford 2.3 in the Ranger gets it's rpm signal from the crankshaft position sensor to the computer ( PCM)
Ford calls this signal the PIP ( profile ignition pickup) The factory tachs in these pickups use a tach signal sent from the pcm to the gauge cluster. I'm not sure if an aftermarket tach would be able to operate properly using this same signal or not?

Eddie H. · 02-10-2005, 09:49 PM

oops. I guess I didn't read your post very well. I thought you said you had a 4 cyl from a 98 Ford Pickup. Anyway, if it's from a car, the DIS ign systems all operate basically the same way.

**'70_402** · 02-11-2005, 11:11 AM

it is from a pickup...where would the signal come out at?? would there be markings on the pcm??? does anyone have a diagram for this??

Eddie H. · 02-11-2005, 09:38 PM

If you're using the original Ford wiring harness, The 104 pin connector that
goes into the PCM should have very small numbers on the back side that correspond to each pin. The tach signal wire out of the pcm is a tan wire with a violet stripe. It comes out of pin 48.

gmc67swb · 02-11-2005, 10:08 PM

Quote:

Originally Posted by Eddie H.

If you're using the original Ford wiring harness, The 104 pin connector that
goes into the PCM should have very small numbers on the back side that correspond to each pin. The tach signal wire out of the pcm is a tan wire with a violet stripe. It comes out of pin 48.

WOW, how long have you been sitting on that information?

Do you work on these things daily or what? Very impressive.

Eddie H. · 02-11-2005, 11:36 PM

Yea, I work on Fords for a living. I figure that a good doctor needs to be where the sickest patients are

gmc67swb · 02-12-2005, 11:06 AM

Quote:

Originally Posted by Eddie H.

Yea, I work on Fords for a living. I figure that a good doctor needs to be where the sickest patients are

I like that. You're pretty close to the airport right? I work at 360 and Trinity,"Ft Worth"

Eddie H. · 02-12-2005, 12:02 PM

Quote:

Originally Posted by gmc67swb

I like that. You're pretty close to the airport right? I work at 360 and Trinity,"Ft Worth"

I guess we're practicaly neighbors then, I just live a few miles west of there.

02-10-2005, 06:38 PM	#1
'70_402 Senior Member Join Date: Dec 2003 Location: Pampa, Texas Posts: 1,554	Tach on new distributorless ignitions?? How do you hook up a tach on a distributorless ingnition motor.....got a sand rail with a 98 ford 4 cylinder in it and was wondering how i hook up a tach...no distributor??? anyone done this?? Thanks Rick __________________ https://www.ebay.com/itm/295742064443

02-10-2005, 07:09 PM	#2
redz 1970 K5 OBS guy Join Date: Jun 2004 Location: SoCal Posts: 1,060	You can use a magnetic pickup. Not sure of the implications, but I know this pickup can be used for the tach signal. Think it measures crank rotation by the harmonic balancer somewhere. __________________ 88 Suburban Goodies- Alpine, Auto Meter, BDS, Bilstein, B&M, BFG, Borgeson, Bushwhacker, Cowl hood, Flowmaster, Genuine Gear, Holley, Infinity, JVC, K&N, MB Wheels, MSD, Pioneer, Skyjacker, Sony, Thorley, Walker + more

02-10-2005, 09:42 PM	#3
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	The Ford 2.3 in the Ranger gets it's rpm signal from the crankshaft position sensor to the computer ( PCM) Ford calls this signal the PIP ( profile ignition pickup) The factory tachs in these pickups use a tach signal sent from the pcm to the gauge cluster. I'm not sure if an aftermarket tach would be able to operate properly using this same signal or not? __________________ "Negative people always seem to have a problem for every solution"

02-10-2005, 09:49 PM	#4
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	oops. I guess I didn't read your post very well. I thought you said you had a 4 cyl from a 98 Ford Pickup. Anyway, if it's from a car, the DIS ign systems all operate basically the same way. __________________ "Negative people always seem to have a problem for every solution"

02-11-2005, 11:11 AM	#5
'70_402 Senior Member Join Date: Dec 2003 Location: Pampa, Texas Posts: 1,554	it is from a pickup...where would the signal come out at?? would there be markings on the pcm??? does anyone have a diagram for this?? __________________ https://www.ebay.com/itm/295742064443

02-11-2005, 09:38 PM	#6
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	If you're using the original Ford wiring harness, The 104 pin connector that goes into the PCM should have very small numbers on the back side that correspond to each pin. The tach signal wire out of the pcm is a tan wire with a violet stripe. It comes out of pin 48. __________________ "Negative people always seem to have a problem for every solution"

02-11-2005, 11:36 PM	#8
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	Yea, I work on Fords for a living. I figure that a good doctor needs to be where the sickest patients are __________________ "Negative people always seem to have a problem for every solution"



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