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Author Topic: 4 cyl tach vs. 6 cyl?  (Read 2192 times)

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Offline JayRamb

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4 cyl tach vs. 6 cyl?
« on: September 26, 2011, 05:01:51 AM »
I have a 4 cyl tach. Why wouldn't that fit in the gauges for the 258 6 cyl? I am thinkning the stamping is just for assembly line folks. Appears that the plug in is the same for the car
Jayson H.
Best HWY Mileage of 87 Eagle:  26.2 MPG

Believer in AMSOIL & Seafoam
1987 Garnet Red Eagle Wagon: 70,500 miles
1967 Rambler Rebel 4 Door 290 V8 (original family car) Marina Aqua 142K miles
1985 Eagle Wagon in Autumn Brown 74,800 miles as my daily driver
SOLD 1984 Black Eagle Limited w/Tach & gauge cluster: 245,100 miles SOLD

Offline GRONK

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Re: 4 cyl tach vs. 6 cyl?
« Reply #1 on: September 26, 2011, 10:29:42 AM »
A 4cyl tach won't read properly on a 6cyl engine unless it has a 4-6-8 switch on the back (some do)  Other than that, they all hook up the same way.
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Offline Jurjen

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Re: 4 cyl tach vs. 6 cyl?
« Reply #2 on: September 26, 2011, 11:59:45 AM »
"sparrows fly in flocks, eagles fly alone"

Eagle Wagon Limited 1983, Citroen C-Crosser 2010, Triumph Bonneville 1969, Yamaha XJR1300 1999, Yamaha TX750 1973

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Offline JayRamb

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Re: 4 cyl tach vs. 6 cyl?
« Reply #3 on: September 26, 2011, 12:29:53 PM »
Thanks guys. I will need to put that aside.
Jayson H.
Best HWY Mileage of 87 Eagle:  26.2 MPG

Believer in AMSOIL & Seafoam
1987 Garnet Red Eagle Wagon: 70,500 miles
1967 Rambler Rebel 4 Door 290 V8 (original family car) Marina Aqua 142K miles
1985 Eagle Wagon in Autumn Brown 74,800 miles as my daily driver
SOLD 1984 Black Eagle Limited w/Tach & gauge cluster: 245,100 miles SOLD

Offline captspillane

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Re: 4 cyl tach vs. 6 cyl?
« Reply #4 on: September 26, 2011, 04:00:45 PM »
I have personally broken at least 6 factory tachometers that were barely working when I got them. I have six or eight other tacs that were already broken when I got the car. I don't have a single one that still works. They are total junk and a complete waste of time.  

I have figured out how to install a 4.0 Jeep Cherokee Tachometer into our dash. I will post pictures once I finish it. Those are reliable and I do think it will look nice and factory correct when I finish with it.

The gist is that the metal on the face of the tach has to be trimmed down to fit. The actual mechanism is considerably smaller than the entire face and it will fit our dash housing once properly trimmed. Right from the start you have to cut off the little lip that angles forward from the rest of the face. The scale itself does not need to be altered. I took an Eagle quartz clock out and seperated the front of the plastic from the rest of the unit. I scribed an arc using a lid from a jar, and then a straight line at the bottom, and then continued to scribe until the shape was removed from the plastic. The plastic got set over the trimmed aluminum tach face and holes drilled to match the holes for the alignment pins. The aluminum face was then trimmed further on the bottom and sides.  On the back of the unit are three screws that also serve as input connections. The input wires connect directly to those screws.
« Last Edit: September 26, 2011, 04:03:15 PM by captspillane »
Currently Inspected and Insured as of Jan 2013:
-1985 Eagle Station Wagon 258 T5 Stickshift
-1980 Eagle Station Wagon 258 Auto Fuel-injected with GM TBI

Minor Repairs Underway:
-1982 Eagle SX4 258 T5
-1981 Kammback 2.5L Iron Duke T5

Restoration Efforts Near Completion:
-1982 SX4- 401 NV3550
-1983 SX4- 4.5 MPI NSG370 (6 Speed)

Restoration Efforts Underway:
-1985 SW- 4.0 MPI AX15
-1982 SX4- 4.0 AW4
-1981 SX4- SD33T NV4500 (Turbodiesel 5 speed)

Future Rescue Efforts- '85 Maroon SW, '87 Limited SW, '84 Limited SW, '87 4 door Sedan, '81 2 door Sedan, '88 White SW, '77 4 door Hornet, '74 2 door Hornet, '79 Spirit AMX, '81 Kammback.

RIP- Red '81 SX4, '84 4dr Sedan, '84 SW, '81 SW, '80 Spirit, '83 SW, '83 4dr Sedan

Offline El Matador

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Re: 4 cyl tach vs. 6 cyl?
« Reply #5 on: September 26, 2011, 04:36:28 PM »
I've looked at those Cherokee tachs numerous times while roaming the junkyard, and wondered if they could be adapted to our cars.  I'll have to pick up one or two next time I'm there, and experiment a bit.

As for the original tachs, I guess I'm one of the lucky ones.  After 25 years and 358,000 km (222,000 miles), the one in my '86 is still working fine.
1973 Matador 2 door
1979 Concord 2 door
1980 Concord 4 door
1980 Eagle 2 door
1980 Eagle 2 door
1981 Eagle SX/4
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1982 Concord 2 door
1987 Eagle wagon

Offline thereverendbill

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Re: 4 cyl tach vs. 6 cyl?
« Reply #6 on: September 26, 2011, 06:33:38 PM »
if you are intersted in selling the 4cyl tach please send me a PM.  best of luck with your project (I think there is a writeup around that someone used an aftermarket tach in the dash and used the factory face)
1980 Eagle 2 door sedan (future solid axle swap)
1981 Eagle Kammback (restoration in progress)
1983 SX/4 SOLD
1983 Eagle Limited wagon  *For Sale* SOLD
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Offline JayRamb

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Re: 4 cyl tach vs. 6 cyl?
« Reply #7 on: September 26, 2011, 10:40:31 PM »
My buddy claimed the 4 cyl tach otherwise I would've offered it to you!
Jayson H.
Best HWY Mileage of 87 Eagle:  26.2 MPG

Believer in AMSOIL & Seafoam
1987 Garnet Red Eagle Wagon: 70,500 miles
1967 Rambler Rebel 4 Door 290 V8 (original family car) Marina Aqua 142K miles
1985 Eagle Wagon in Autumn Brown 74,800 miles as my daily driver
SOLD 1984 Black Eagle Limited w/Tach & gauge cluster: 245,100 miles SOLD

Offline thereverendbill

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Re: 4 cyl tach vs. 6 cyl?
« Reply #8 on: September 26, 2011, 11:01:13 PM »
My buddy claimed the 4 cyl tach otherwise I would've offered it to you!
not a problem as long as it gets some use ;D
1980 Eagle 2 door sedan (future solid axle swap)
1981 Eagle Kammback (restoration in progress)
1983 SX/4 SOLD
1983 Eagle Limited wagon  *For Sale* SOLD
1988 Jeep Comanche Pioneer (daily driver)
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another amc forum
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Offline mick

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Re: 4 cyl tach vs. 6 cyl?
« Reply #9 on: September 27, 2011, 05:06:15 PM »
There is always this option.  I still need to buy one for Rat Rod to go from the stock YJ 6cyl tach to the 500 Caddy.


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