Tach Plug, 92 & 93 trucks - A

Paccool · 03-13-2007, 09:21 PM

Hope this is of some help for folks trying to find the stock tach plug. May also apply to 91.5 and newer as well as the 92 and 93's.

The plug is a small flat plug and is located close to the steering column under the dash. The repair manual calls out "Near the fuse block". I think the plug is grey but can't remember for sure. There are 4 wires going to it -

Black -Ground
orange - Switched 12V
red - switched 12v to signal flasher(don't ask cause I don't know!! )
Gray - tach signal from the PCM

The crankshaft position sensor is where the signal originates and then goes to the PCM and on to the plug. You should be able to check for a reading at the gray wire with a digital meter. My PCM was bad and it took me a year to figure out what was going on. A new PCM solved the problem.

__________________
Stan

93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Front end rebuilt with new springs - 2 " taller now. Single stage Water/Meth system installed. Oversized intercooler installed 10/06, 3" IC lines.

"if you're not part of the solution, you're part of the problem"

pullin the hard way · 03-14-2007, 03:01 PM

huge help stan thanks what tach would you recomend?

__________________
1995 laramie slt 4x4 auto, 1991 4wd no i/c 5spd locked diffs pump tweaked centreforce df clutch 5" stacks modified suspension, 1992 2wd auto w/od pump tweaked, POD's, 60# valve springs, 366 gov spring, 4" dp to 5" side pipes 230hp 590#tq 05/19/08

Paccool · 03-14-2007, 03:09 PM

I got lucky and scored one of the OEM tachs that were used. It was still in the box!

Isspro makes one that plugs in, I think the autometer will work but I'm not 100% positive on that one.

dpuckett · 03-16-2007, 07:14 PM

ISSPRO makes a wiring harness with a diode in it for the plug-n-play for our trucks. Otherwise, it may or may not work. I have had good luck with the ISSPRO gauges I've run.

paccool- what year vintage of 92 is your truck? I have a black, grey, black (maybe brown, but definitely not red), and orange wire.

If you cant/ dont want to use the factory plug, dont worry- there are lots of options out there. Last truck I had was an early 91 and I used the sensor and magnets (from ISSPRO) on the balancer for my signal. Others use an alternator signel somehow.

Daniel

03-13-2007, 09:21 PM	#1 (permalink)
Paccool Admin Join Date: Nov 2005 Location: NorCal Posts: 2,120 Paccool's Truck Pics	Tach Plug, 92 & 93 trucks - A Hope this is of some help for folks trying to find the stock tach plug. May also apply to 91.5 and newer as well as the 92 and 93's. The plug is a small flat plug and is located close to the steering column under the dash. The repair manual calls out "Near the fuse block". I think the plug is grey but can't remember for sure. There are 4 wires going to it - Black -Ground orange - Switched 12V red - switched 12v to signal flasher(don't ask cause I don't know!! ) Gray - tach signal from the PCM The crankshaft position sensor is where the signal originates and then goes to the PCM and on to the plug. You should be able to check for a reading at the gray wire with a digital meter. My PCM was bad and it took me a year to figure out what was going on. A new PCM solved the problem. __________________ Stan 93 D250, PDR Twins HX35&HT3B, 60+# boost,PDR stage 2 head w/o-rings, PDR Cam, modified VE Pump, piston style lift pump, modified 5" intake w/AFE, ATS ported manifold,DTT 89% converter, 4" RIP exhaust, modified tranny, EGT/boost/tranny/tach gauges, TPS removed, a little chrome under the hood. Mag-Hitec tranny and diff. covers. Rear sway bar. Line-x bed liner, after market seats. Front end rebuilt with new springs - 2 " taller now. Single stage Water/Meth system installed. Oversized intercooler installed 10/06, 3" IC lines. "if you're not part of the solution, you're part of the problem"

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03-14-2007, 03:01 PM	#2 (permalink)
pullin the hard way Cummins Fan Join Date: Dec 2006 Posts: 45 pullin the hard way's Truck Pics	huge help stan thanks what tach would you recomend? __________________ 1995 laramie slt 4x4 auto, 1991 4wd no i/c 5spd locked diffs pump tweaked centreforce df clutch 5" stacks modified suspension, 1992 2wd auto w/od pump tweaked, POD's, 60# valve springs, 366 gov spring, 4" dp to 5" side pipes 230hp 590#tq 05/19/08

03-14-2007, 03:09 PM	#3 (permalink)
Paccool Admin Join Date: Nov 2005 Location: NorCal Posts: 2,120 Paccool's Truck Pics	I got lucky and scored one of the OEM tachs that were used. It was still in the box! Isspro makes one that plugs in, I think the autometer will work but I'm not 100% positive on that one.

03-16-2007, 07:14 PM	#4 (permalink)
dpuckett Cummins Fan Join Date: Mar 2007 Location: Cape Girardeau MO Posts: 65 dpuckett's Truck Pics	ISSPRO makes a wiring harness with a diode in it for the plug-n-play for our trucks. Otherwise, it may or may not work. I have had good luck with the ISSPRO gauges I've run. paccool- what year vintage of 92 is your truck? I have a black, grey, black (maybe brown, but definitely not red), and orange wire. If you cant/ dont want to use the factory plug, dont worry- there are lots of options out there. Last truck I had was an early 91 and I used the sensor and magnets (from ISSPRO) on the balancer for my signal. Others use an alternator signel somehow. Daniel