Aftermarket TACH install in 99 PSD SD??? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 02-05-2007, 04:27 AM Thread Starter
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Aftermarket TACH install in 99 PSD SD???

Hey guys, I'm considering adding an aftermarket Tachometer to my early 99 PSD. I want to have a more accurate reading than the vague OEM in-dash tach. Anyway, is this even possible? I know on gasoline engines you just connect to the coil and voila you have a tach reading. Where do you connect to add an aftermarket tach in a 7.3L 99 PSD??? BTW, I think the Tach wire is under the dash somewhere, I just don't kno where.....

Thanks!!

Truck #1 info: Early '99, 7.3L PSD, 4x4, Ext. Cab.
Mods: BTS TRANNY!!, DP Tuner, Rockwell 2 1/2 ton military axles!
.
Truck #2 info:'02, 7.3L PSD, 6spd, 4x4, DRW, CC.
Mods: B&W gooseneck hitch


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post #2 of 17 (permalink) Old 02-05-2007, 04:41 AM
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The only aftermarket diesel tach I've ever seen is the one by Auto meter and I think it uses an indductive pick up off the alternator or somthing.

Click here, its under 2 5/8 electrical guages.

2004 F-250 Crew-cab XL 2wd 83000 miles . 4" straight pipe.

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post #3 of 17 (permalink) Old 02-05-2007, 04:28 PM
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Isspro has several... But there not going to be anymore accurate then the stocker... You just want to add another gauge I get that, but to say the stocker is vague is a strech...

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #4 of 17 (permalink) Old 02-05-2007, 08:51 PM
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ISSPRO (and other gauge manufacturers) make tachometers which use an output from the alternator for engine speed. These outputs are common on larger diesels, but I don't recall seeing it on my 7.3L's alternator (I didn't drive it today, so I'll have to look at it tonight when I get home). We also make units which can work with Hall-effect sensors (which may be installed to sense flywheel teeth) or inductive sensors (which require a magnet to be installed somewhere on the crank). In some future systems, we will tap directly into the OBDII data from the engine, but then you're reading the same data which is driving the factory tach!

What kind of problems are you having with the factory tach?

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Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD Crew Cab Dually, 271k miles
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post #5 of 17 (permalink) Old 02-05-2007, 09:05 PM
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Why don't you just get an AIC? It has a digital readout of the tach...and is much more accurate than what's in the dash. Plus you can idle the truck up if you need to.
post #6 of 17 (permalink) Old 02-05-2007, 09:13 PM
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I second daves answer. I have the AIC box under the dash in my truck and it reads a little less than the tach in the dash

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #7 of 17 (permalink) Old 02-06-2007, 02:43 AM Thread Starter
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^^ Yeah, I thought about the AIC and that might be the route I take. Im not having any problems with my stock tach. I just dont like how it only reads every 500 RPM's For example, if you're between 1500 and 2000 you have to estimate what you're running. I know this is not that big of a deal for most but I'm running 6.72 gears and 46's. At ~65mph the OEM tach is showing about 2300 to 2400 RPM. I want to know exactly what I'm running so I can slow down a little if needed. I dont feel confortable running the truck for long distances at that high of an RPM. However, I don't really know what I'm running since its between the hash marks...

And yes, I do like gauges and thought a nice 5" tach would look pretty friggin sweet!! haha

Thanks for the info guys!!! I will look into it!

Truck #1 info: Early '99, 7.3L PSD, 4x4, Ext. Cab.
Mods: BTS TRANNY!!, DP Tuner, Rockwell 2 1/2 ton military axles!
.
Truck #2 info:'02, 7.3L PSD, 6spd, 4x4, DRW, CC.
Mods: B&W gooseneck hitch


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post #8 of 17 (permalink) Old 02-06-2007, 03:06 AM
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You could run that motor all day at 2800-2900 and not hurt a thing. Your fuel milage will suffer but the motor will love you.

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #9 of 17 (permalink) Old 02-06-2007, 03:36 AM
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Explain Joe...

Doesnt the high rpms wear out the motor quiker

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #10 of 17 (permalink) Old 02-06-2007, 04:38 AM Thread Starter
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^^^ Yeah, I thought the optimum range is around 2200 to 2300 RPM. :shrug: I thought for a long distance drive, that the motor would not like the 2400 to 2500 RPM range... I know on heavy equipment, you run your machine wide open though, so maybe it wont hurt it. Im also thinking about MPG's At 60mph and 2200 RPM I was at 600* EGT's and 4lbs of boost. At 65mph and 2400 RPM, I ran 650* and 7lbs of boost. The motor is not working at all.

So you're saying its fine to run a PSD for long periods of time at a high RPM like that?? I just never heard that before but it makes sense to a point.

thanks!

Truck #1 info: Early '99, 7.3L PSD, 4x4, Ext. Cab.
Mods: BTS TRANNY!!, DP Tuner, Rockwell 2 1/2 ton military axles!
.
Truck #2 info:'02, 7.3L PSD, 6spd, 4x4, DRW, CC.
Mods: B&W gooseneck hitch


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