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12-10-2013, 02:30 PM
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#1 |
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Registered User
Join Date: Dec 2013
Location: Topeka, KS
Posts: 2
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temperature sending unit
Swapped 250 for modern 350 fuel injected crate engine in my '67. Temp sending unit too large to fit location in block, so temporarily located it in water pump, where temp is always low because it comes directly from radiator.
From other sites, it seems that sending units and gauges must match ohms, but I can't find anywhere that tells me resistance of stock gauge. Can anyone give me a manufacturer and part number of a sending unit that fits and will match my gauge? Kent66610 |
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12-10-2013, 02:39 PM
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#2 | |
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Registered User
 
Join Date: Apr 2013
Location: Gainesville, TEXAS
Posts: 658
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Re: temperature sending unit
Kent,
I have had my parts store search, for a small temp sender with the correct ohms. (Sorry I don't recall the ohm's rating off hand). Maybe your parts store still has the books and maybe they have the ohm's listed like mine did. What I have had to do it drill and tap the FI head to accept the larger sending unit. And I have done it with the engine installed in the truck. It's a bit of a challenge but can be done, by removing the front wheel and drilling and tapping it with extensions. I've done two so far and both work perfectly. Quote:
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1972 Chevrolet Cheyenne LB 1/2 ton finished restoration/rebuild 1995 350 throttle body FI, 4L6E (running on modified GM wiring harness) 3.08 posi rearend, factory A/C on 134A, p/s, p/b, late 70's power windows and locks and cruise, speakers in the dash + 6x9's behind the seat, factory tilt, 40 gallon fuel tank in the bed with integrated tool box, air assist bags on the rearend, sway bar up front and much more. 1972 chevrolet SNB finished 2002, 350 TB FI, TH400, factory A/C, p/b, p/s, (FOR SALE) 1969 Chevrolet 1 ton in work, home made PTO dump bed extended frame, 350 CI , 1972 Chevrolet 3/4 ton suburban future project 1972 Chevrolet 3/4 ton p/u maybe a project one day 1966 Toyota Landcruiser my playtoy |
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12-10-2013, 02:50 PM
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#3 |
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not enough hours in the day
Join Date: Jan 2009
Location: Axtell, NE
Posts: 550
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Re: temperature sending unit
I used this 3/8" sending unit http://shop.advanceautoparts.com/web...le=#fragment-2 and then added resistors in the wire from the sending unit to get the gauge to read correctly. I added either 25 or 27 ohms of resistance.
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65 K-10 Short Step 68 C-50 70 K-5 85 K-10 & piles of spare parts |
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12-10-2013, 03:03 PM
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#4 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: temperature sending unit
I drilled and tapped the head so as to use the original sending unit. NAPA has the ohm resistance information but they could not match the resistance needed in the smaller sending unit size. There may be an aftermarket product since there are a lot of engine swaps being done.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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