89-91 tach versus 92-93 tach

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89-91 tach versus 92-93 tach

Postby bgilbert » Thu Feb 21, 2013 5:46 pm

Thought I'd post a couple part numbers and pics of two OEM/dealer add-on tachs. The first is an early tach for 89-91 and will not work with the 92-93 trucks due to a different plug. It's part number is 56004110. The second is for 92-93 trucks, it's part number is 82400714. Don't buy the wrong one and find out the hard way :( .
Bill Gilbert
85 D350 crew with 90 6BT intercooled Getrag 3.07's
93 D350 single cab Getrag 3.54's.
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Re: 89-91 tach versus 92-93 tach

Postby revemup15 » Thu Feb 21, 2013 6:06 pm

Cut it off and use butt connectors
89 w250 14mm h/r in the works, aeromotive, 63/68 coming soon
94 p-pump
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Re: 89-91 tach versus 92-93 tach

Postby RCCUMMINS89 » Thu Feb 21, 2013 6:25 pm

Never knew the above, thanks Bill.... come in hand if one were trying to "restore" something.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: 89-91 tach versus 92-93 tach

Postby RCCUMMINS89 » Thu Feb 21, 2013 6:27 pm

But now everybody knows bill has at least 2 tachs
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: 89-91 tach versus 92-93 tach

Postby Mark Nixon » Thu Feb 21, 2013 6:39 pm

I've mentioned the differences several times.
If you search, you'll even see where I have mentioned it.

In actuality they ARE the same tachs, just the plug is different.
As you can see the connector pins are even the same shape, just the plug housing is different.
Just remove the housing and connect them to the OEM harness the same way Autometer does with theirs.

BTW, the 1989 and MOST 1990 engines DIDN'T come with notches in the damper for the tach to read off of, either.

Mark.
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Re: 89-91 tach versus 92-93 tach

Postby bgilbert » Thu Feb 21, 2013 7:37 pm

Mark Nixon wrote:I've mentioned the differences several times.
If you search, you'll even see where I have mentioned it.

In actuality they ARE the same tachs, just the plug is different.
As you can see the connector pins are even the same shape, just the plug housing is different.
Just remove the housing and connect them to the OEM harness the same way Autometer does with theirs.

BTW, the 1989 and MOST 1990 engines DIDN'T come with notches in the damper for the tach to read off of, either.

Mark.

Yeah I knew you have been saying it for years Mark, but didn't know if you've ever posted a pic of the two plugs. I thought it would be beneficial for those looking to buy a high dollar tach thinking it will be a plug and play to see what 'plug' to search for.

Philip and I have been thinking the two tachs operated off of different voltages? Has anyone ever done what you suggest, removing the plug and splice it in? revemup15, do you have experience with this? :lol: We sure hate to fry or ruin a high dollar piece.
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Re: 89-91 tach versus 92-93 tach

Postby RCCUMMINS89 » Thu Feb 21, 2013 7:54 pm

RCCUMMINS89 wrote:But now everybody knows bill has at least 2 tachs



And doesn't trim his fingernails very often :lol:
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: 89-91 tach versus 92-93 tach

Postby Mark Nixon » Thu Feb 21, 2013 8:19 pm

Bill, I also have had both tachs side by side, even the wiring color codes are the same.
If you look at the underdash harness, though the early version is a bit more confusing to sort out, it ends up being the same layout, the connectors are just shaped differently.
The early style CPS just doesn't have a low voltage wire added in to tell the ECM there's a problem.

In the early version, the tach plug piggy-backs to something else in the harness, but I forget what it was.

Mark.
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Re: 89-91 tach versus 92-93 tach

Postby Mark Nixon » Thu Feb 21, 2013 8:35 pm

Couple of pics, courtesy of DTR, posted by BobS on 1stgen:

Early under dash wiring shots:
Image

Image

Late under dash harness/pigtail shot:

Image


Mark.
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Re: 89-91 tach versus 92-93 tach

Postby DodgeFreak » Fri Feb 22, 2013 6:09 am

I had an 89-91 tach in my 92 before i sold the tach, I just made jumper wires for it. Seemed to be right.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: 89-91 tach versus 92-93 tach

Postby bgilbert » Fri Feb 22, 2013 8:04 am

DodgeFreak wrote:I had an 89-91 tach in my 92 before i sold the tach, I just made jumper wires for it. Seemed to be right.

Thank you, very good to know.

RC, that was the girlfriend's nails lol.
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Re: 89-91 tach versus 92-93 tach

Postby RCCUMMINS89 » Fri Feb 22, 2013 8:07 am

LOL... well that explains it.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: 89-91 tach versus 92-93 tach

Postby turboram » Sun Feb 24, 2013 11:18 am

My local dealer said he remembers seeing a nib tach for a first gen on the shelf not long ago.... he is looking for it for me :)
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Re: 89-91 tach versus 92-93 tach

Postby apexfd » Sat Jun 01, 2013 9:27 pm

Is there a good tach kit for Early trucks?
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Re: 89-91 tach versus 92-93 tach

Postby rockbuggy4x4 » Sun Jun 02, 2013 3:29 pm

If one were to put a tach on an early model (89-90) they would need the later dampner? And does anyone know if the under dash plug is there?
Jimmy
--> '85 cab w/ '89 engine and trans stock with minor pump tweaks and a flatbed. **soon to get lots of goodies**
--> '95 jimmy not so stock

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