Factory Tach Pickup - Dodge Diesel

PADuallyBoy · 01-25-2009, 11:46 PM

Right now I'm trouble shooting my tachometer. It's from RW Gauges and it uses the factory tach pickup. The tach wires just plug into the line from the pickup that are in the wire harness by the fuse box. The gauge is acting fun though, it has my idling like 250, almost like the pickup is weak. I replaced the capacitor that is in the wiring diagram. (This gauge was put in like a year or to after the truck rolled off the line, so it's older... but NOT from the factory.) So I'm thinking it's maybe the pickup by the harmonic balancer, I don't know, it's almost 1 in the morning so I have the look at it after work. Also with the pyro, also from RW... it seems slow in responce. It only has the two leads from the probe going to the back of the gauge. The probe is in the downtube, I thought I saw somewhere pyros the were calibrated for before turbo and after turbo, and the whole thing is setup the way the manual says so I don't, more trouble shooting I guess. Help would be appreciated, Thanks!

77machomopar · 01-26-2009, 01:45 AM

if it was your crank sensor your alt. wouldn't charge the battery and the computer would think that the engine is not running.

Stihl · 01-26-2009, 01:58 AM

I'm interested in this too .. as sometimes my factory tach reads normal. And other times it doubles my actual RPM speed

RollinCoalSmoke · 01-26-2009, 07:12 AM

I'm having problems with mine also. I don't have any manual or book telling how to trouble shoot it. It didn't work when I bought the truck about 1 1/2 years ago but would like to get it working.

Peej · 05-16-2010, 11:46 AM

Quote:

Originally Posted by Stihl

I'm interested in this too .. as sometimes my factory tach reads normal. And other times it doubles my actual RPM speed

Yes! Thankyou for having the same problem hahaha! mine was fine, and I would say about anywhere between now and January it started to read higher, and yes even double what it should! Ive hit 4g! hahahah, so, what the hell is the problem?

01-26-2009, 01:45 AM	#2
77machomopar Registered User Join Date: Dec 2007 Location: Mohrsville Pennsylvania Posts: 593 My Photo Gallery My Classified Ads	if it was your crank sensor your alt. wouldn't charge the battery and the computer would think that the engine is not running. __________________ 2001 2500 QCLB 4x4 Auto 247,000 miles

01-26-2009, 01:58 AM	#3
Stihl Registered User Join Date: Apr 2008 Location: Washington Posts: 328 My Photo Gallery My Classified Ads	I'm interested in this too .. as sometimes my factory tach reads normal. And other times it doubles my actual RPM speed __________________ 93 12 valve 4x4 58k miles Built A518 w/ Transgo shift kit Locked Dana 60/70 8" lift, 39.5x18 Boggers on 16.5x14 Weld super singles Dual 5" Straight Stacks DennyT StageII Fuel Pin ASA Cold Air Intake P.O.D.'s 2000 24 valve 4x4 134k miles 7" BDS lift, 37x13.5x18 Toyo MT's SB Con OFE w/ hydraulic upgrade Edge Juice w/ Attitude H/U, FASS pump 5" MBRP Straight Pipe

01-26-2009, 07:12 AM	#4
RollinCoalSmoke Registered User Join Date: Jan 2009 Location: H'ville Tx. Posts: 936 My Photo Gallery My Classified Ads	Factory Tach I'm having problems with mine also. I don't have any manual or book telling how to trouble shoot it. It didn't work when I bought the truck about 1 1/2 years ago but would like to get it working. __________________ 1. 92 LE W350 ex-cab-518 auto-4'' lift-Gear Vendors Overdrive-4:10 Gears-Big Ole Jukebox-CowCatcher front bumper-Few Pump Mods-Denny T Stg 2-6'' Chimneys-Banks Fiberglass Hood W/Scoop-Factory sliding back glass-4'' exhaust 2. 1993 LE W350-ex-cab-5 sp. Getrag-3:54 gears-Pump Mods-Denny T Stg. 2 -4'' exhaust-6'' smoke poles. 3. Shop full of stuff.

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05-16-2010, 11:46 AM