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Thread: 4bt tach?

  1. #1
    Join Date
    Jul 2003
    Location
    baton rouge (near)
    Posts
    146

    4bt tach?

    how can i run a tach on my 4bt? my alt is new, and does NOT have a tach output. its a cpl0858 from frito lay and i need to know if there is an easy way. . . .



    also if i am not, and dont believe i can, run an intercooler, can i run a 12cm housing?
    Last edited by LAlessi; 04-26-2004 at 12:51 PM.

  2. #2
    Join Date
    Jan 2004
    Location
    Northern California
    Posts
    242
    Isspro makes a kit for the 1989-1993 DC that should work. I used it to great effect on my previous non-tach diesel and was able to drive an OEM V8 tachmoeter using 4 rare earth magnets and their pickup.



    Isspro DC Tach Sensor Kit
    1985 CUCV M1028, FF/D60/Dana LSD front and FF 14 bolt corporate/detroit locker in the rear, NV4500, NP208. CTD 6BT/P7100 CPL1959, KDP killed, 16.5*, 320HP inj., 4GSK, 60# v.s., #10 plate, PDR HX35 14cm non/wg, ATS manifold, PDR overflow valve, 191 DVs, Southbend Con O.

  3. #3
    Join Date
    Jul 2003
    Location
    baton rouge (near)
    Posts
    146
    ok, what does that stuff attach to??? i dont mind the money. . . .

  4. #4
    Join Date
    Dec 2001
    Location
    Torrington,CT
    Posts
    4,861
    I have an Isspro tach that simply runs off the alternator. It does not use the sensor kit.

    I had to remove the back cover of the alternator and connect a wire to one of the rectifyer leads.

    It then had to be calibrated with a hand held optical tach.

    Tach works good. Just another option.

    Jay
    Current-05 1500 2wd Gasser V6 auto
    Ex-1991 (non-intercooled) D250 5 spd 152K miles. K & N filter/enhanced flow airbox, Isspro boost, pyro, and tach,16 cm, pump FW, 4" exhaust, Bully Dogs, Blaupunkt CD, Dead KDP, Frankenturbo,CGFP
    Latest dyno number...241rwhp/604rwt

  5. #5
    Join Date
    Dec 2003
    Location
    Northeast
    Posts
    484
    Auto Meter makes a diesel tach that mounts a sensor on the outside of the alternator. It does require calibration after install.

    I plan to order one this week for my 4bta in my 1943 Dodge Carryall. Sorry, I am on the road and dont have the model number with me. The price is very reasonable.



    WM-300
    2003, HO, 6 Speed, Jake

  6. #6
    Join Date
    Jan 2004
    Location
    Northern California
    Posts
    242
    The magnetic sensor bolts onto the timing cover in the same way the stock one does on the later years. The sensor is set with an air gap so that the magnets pass by close enough to trigger a pulse.



    A 4 cylinder tach requires two magnets and V8s need 4. It's very accurate and won't require calibration.
    1985 CUCV M1028, FF/D60/Dana LSD front and FF 14 bolt corporate/detroit locker in the rear, NV4500, NP208. CTD 6BT/P7100 CPL1959, KDP killed, 16.5*, 320HP inj., 4GSK, 60# v.s., #10 plate, PDR HX35 14cm non/wg, ATS manifold, PDR overflow valve, 191 DVs, Southbend Con O.

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