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I am instslling gauges in my 89. I have everything hooked up but still need a tach. I'm not sure where to connect one. I have seen tachs with alternater hook ups and magnetic pick ups that read flywheel teeth. A post on another forum talked about a wire under the dash on the left side. I found an unconnected wire but don't know what kind of reading to look for on a meter.I'm using SW Max Performance white face guages. Pyro, boost, trans temp, oil temp, and water temp. Any help on the tach will be appreciated.
89silveram
2WD totaly stock
The alt tach or the flywheel tach is about your only options from a vender. The AutoMeter model is a 2888. The flywheel model I am not sure who the vender was that sold that type.
Your year model doesn't have the provisions for the factory tach. That started in 91.5 on some trucks. It was kind of hit or miss. All the 92/93 models had factory provisions.
you should have posted this in the 1st gen non-powertrain section. I am sure a mod will find it and move it soon.
You can buy some nice diesel tachs at summitracing.com
But he needs to provide some sort of signal for them to work. His year model does not provide anything for a tach.
The two listed earler is the easyest ones for his year model. If he wants to do some fab work. Then there are some other options out there. All of them means installing sensors and assembling everthing in parts.
I intend to install a tach on my 91 CTD as well. My plan is to take my alternator to an auto electric shop and have them add a +W terminal to the alternator.
I have a used boat tachometer (cheap on eBay) that will connect to the newly installed +W terminal.
Alternators almost always don't run the same RPMs as the engine. Boat tachs have a selector on the back to set the number of pulses per revolution. This adjusts for the difference between engine RPM and alternator RPM, and provides a rather accurate engine RPM indication.
The boat tach needs 3 wires: +W, +12v, Gnd. You can add a 4th wire and tap into the dash lights and get illumination for the tach.
This might be a good plan for you. I suppose the cost of having the shop add the +W terminal is cheaper than buying a marine CTD alternator that already has the +W terminal.
I saw instructions on-line some place to do the alternator conversion yourself. Unfortunately I don't remember where I saw it.
Aloha, Dean.
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Aloha from Kona, Hawaii. Captain Dean Towle
1991.5 Dodge Ram W250 CTD w/IC 4x4 5-speed Hummer wheels & tires
Captain, You read my mind. I was gonna call the guy that repairs my boat. There are a ton of boats up here with the 210 cummins. I was gonna pick his brain on what he installs in boats. My old Perkins was run off from the alt. My Mitsibishi is run off from a sensor on the motor.
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89 dodge 3/4 4x4, A727 ,3.07 gears, factory L S , powerstroke intercooler, S300, stans exaust with stainless tailpipe, fuel power screw turned?, fuel pin turned to deepest, 3 turns smoke screw, 1/2 turn down on starwheel. 93 W250 ex cab, 6X16's, 60 GDS, rag
4 simple steps and you too can have your alternator drive your tach...
Lots cheaper than an alternator shop !!!
OH --- there are 4 steps 4 separate posts.
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'93 D250 Auto CC HX-40 60/65/17 w/hx50 flange - hit 57 held 55 psi OOPS => 6x16's <=, PS IC, CoolerTubz, 366 spring w/2 turn clipped, power screw bottomed-backed off 1 1/2 turn, M2 power pin, smoke screw fully out, custom AFC spring, modified top to get pin higher, '94 built trans - clutches and some hard parts, trans cooler under bed in front of rear wheel, 4510 w/4 1/2" intake and heat shield, htr grids MIA, 4" dp -> 5" pipe -> 5" Stack, 285's rear 265's front
I'm not registered at TDR either and I don't take their magazine to enable registering. Non members can only see the first page of a post older than 7 days.
I did manage to find steps 1, 2, 3 and pictures 1 and 3. Unfortunately these were the external steps and pictures.
If I can accumulate the entire set I'll be glad to post it here.
Aloha, Dean.
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Aloha from Kona, Hawaii. Captain Dean Towle
1991.5 Dodge Ram W250 CTD w/IC 4x4 5-speed Hummer wheels & tires
That should cover it...
I thought the same was posted here but I can't find it....
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'93 D250 Auto CC HX-40 60/65/17 w/hx50 flange - hit 57 held 55 psi OOPS => 6x16's <=, PS IC, CoolerTubz, 366 spring w/2 turn clipped, power screw bottomed-backed off 1 1/2 turn, M2 power pin, smoke screw fully out, custom AFC spring, modified top to get pin higher, '94 built trans - clutches and some hard parts, trans cooler under bed in front of rear wheel, 4510 w/4 1/2" intake and heat shield, htr grids MIA, 4" dp -> 5" pipe -> 5" Stack, 285's rear 265's front
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93 W250 ex cab, 6X16's, 60 GDS, rag 
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