M998 Hmmwv tach installed.

[TNriverjet]

This may help...

View attachment Tachometer-A2.pdf

 

[Retiredwarhorses]

If anyone has a particular question about the install, just ask and I will translate from the 8 page doc.

as a start, the rear of the Tach from left to right on the lugs is as follows:

term post pos leads458 "2"
term post sig wire 12
term post sig wire 13
term post neg wire 58 "2"

the last 4 wires branch off to a Ste/ice toggle switch...not sure if you have this or not, and I'm assuming this is the Same kit.its for an ambulance

 

[Jon0249]

Thanks for the picture, but I'm going a little sideways. Not using a HMMWV tach, but a Faria 4000 rpm Pro Red 12v version. Plan is to mount it on the underside of the radio shelf, facing the driver. So, it's not really the install sheet I need, but an understanding of which lead coming off the transducer should feed my TCM. I have a 12V supply and one tach input line to the TCM, but am not sure which of the 2 leads coming off the transducer I should use. I suppose trial and error would work, but not really keen on risking frying the TCM.

 

[Retiredwarhorses]

The mods should really create a new forum for the HMMWV as they did for other vehicles on mods of a particular vehicle.
a sub forum per say....if it ain't NOS and in the TM's, it belongs elsewhere.
FWIW....

 

[M114]

Wanted...Doghouse Tach. Wireing Instructions

Wish I had the instruction manual that comes with the complete doghouse tach kit. I saw the complete kit on ebay recently, but the seller wouldnt give me a copy of the instructions (I offered cash for a pdf scan). My HMMWV has it mounted to the doghouse (same tach as pictured on the thread), ready to go, but gotta figure out where to wire it. I have the dual volt 100A alt. maybe the ign lug ?

I too would like to see a copy of the Instructions for installing the doghouse tach kit.

 

[florky]

Doghouse Tach

Here's my install of the Tach on the doghouse.

Followed the wiring instruction provided with the Tach from TNriverjet

Used 2 trailer extension cables for the disconnect to remove the doghouse when needed (greased with dielectric grease for better connection and easy removal)
Wired with different connectors on each side so tach can not be plugged in the wrong way.

Trimmed the doghouse insulation removed from the opening into strips and secured to the ouside of the Tach with zip ties
Sealed all electrical connections and light wire opening on the back of the tach with copious amounts of liquid electrical tape
Wrapped the whole unit in silver exhaust tape.

The hardest part of the whole install was making the hole in the doghouse snug to the outside of the tach. Cut it close then used a file for fine tuning.

 

[Action]

how does that look at night being that bright?

 

[florky]

Look fine - really not as bright as it looks in the pics and being out of sight line it's not distracting.

 

[RichDane]

Florky Was size (If you remember) did you use to cut the hole for that snug fit in the doghouse?

 

[RichDane]

In Dash Install with New Tach

Florky Was size (If you remember) did you use to cut the hole for that snug fit in the doghouse?

Changed my mind on the doghouse install, went with the dash...absolutely love it !!!!!

 

[TOM R]

I just bought a tach just like the one you have in your HMMWV for a little over $3.00 from Ebay; the description indicted it was "new". I am hoping it will work in my M1008A1 with the 6.2 & 24 volt system. I may want to talk you out of a photo of where the wires go. I'll include a photo of the front and back. The seller has more of these by the way.

are these still available ad how has it held up

 

[TOBASH]

And like Lazarus, another thread back from the dead.

Easy to install. Kits all aver. Steal power from wipers or dash and plumb into the oil pressure thingy under the hood. Several more recent write ups.