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06-06-2017, 08:27 AM
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#1 |
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Registered User
Join Date: Jun 2012
Location: cibolo tx
Posts: 1,033
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OEM diesel 4k tach
I need to know how to use this OEM tach from a v8 diesel truck into my p pump cummins to throw a curveball. I have the entire cluster with wiring harness with power, ground and a brown wire that goes to an unknown location.
This is a real GM diesel tach and there is practically NO info on how to use it. The cluster was a mechanical speedo 85-87 gmc 7000 with the detroit. Anyone here have any idea how to use this 8 cyl tach with a 6 cylinder 12 valve? Thanks 
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1985 k5 396/nv4500/203/205 d60/d70 4.56 42 sx2 1991 V3500 350/4l80/205 60/14 4.10 35 toyos. |
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06-06-2017, 02:51 PM
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#2 |
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6>8 Plugless........
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,133
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Re: OEM diesel 4k tach
Is that tach electric or mechanical? If it is electric, you'll need to figure out if they used a 4 pulse signal or not like the gas tachs are. If that is the case, you machine 2 more grooves in your vibration dampener and use the dodge pick up sensor. You have to solder in a 1k ohm resistor in between the hot and ground wires of the signal wires for the pick up to work. Ive read of it being done on 4btswaps. I have not done it on mine but am going to someday.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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06-06-2017, 08:00 PM
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#3 |
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Registered User
Join Date: Jun 2012
Location: cibolo tx
Posts: 1,033
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Re: OEM diesel 4k tach
It's an electric one. Thanks for some direction. I'll try and find some more info.
__________________
1985 k5 396/nv4500/203/205 d60/d70 4.56 42 sx2 1991 V3500 350/4l80/205 60/14 4.10 35 toyos. |
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06-06-2017, 08:57 PM
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#4 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,133
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Re: OEM diesel 4k tach
Was this tach from a 8.2 Detroit?
__________________
Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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06-06-2017, 09:10 PM
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#5 |
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Registered User
Join Date: Jun 2012
Location: cibolo tx
Posts: 1,033
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Re: OEM diesel 4k tach
That's exactly where it came from
__________________
1985 k5 396/nv4500/203/205 d60/d70 4.56 42 sx2 1991 V3500 350/4l80/205 60/14 4.10 35 toyos. |
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06-06-2017, 09:24 PM
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#6 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,133
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Re: OEM diesel 4k tach
I can't remember where they picked up off those. It's been a long while since I had to work on one. :LOL: I'll keep looking and try to help you find the signal specs.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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