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Johnous
John Montgomery

(22 posts)

Registered:
01/11/2010 01:29PM

Main British Car:
1978 MGB Roadster 3.5L British Leyland V8

Smiths Temperature Gauge and Rover EFI
Posted by: Johnous
Date: September 18, 2015 03:12PM

I am running a 1978 MGB with a Meqasquirt-n-spark 3.5L. This is building off of Curtis' excellent piece here: [forum.britishv8.org]

I intend to use my original '78 MGB Smiths gauges with the 1/8" x 27MPT temperature sensor port in the Rover EFI intake. My goal is to therefore mimick the original resistance of the Lucas sending unit, but fit within the confines of Rover's threaded intake hole.

The original Lucas sending unit operates on this resistance scale (taken from [www.mgexp.com]):
33 F 1850 ohm
50 1600
60 810
90 500
105 380
125 265
140 180
165 118
170 111
185 83
190 74
200 66
204 60
208 55
210 54

To anyone in a similar position, it appears that the following sender will work with the Smiths gauges AND the Rover EFI intake:

[www.napaonline.com]
ECH TS6723
Temp Sender Switch Temp Rating : 450ohm At 100 Deg F, 46.6ohm At 220 Deg
Temperature Switch Thread Size : 1/8" x 27 MPT

Of course, if anybody has information that can help clarify it is greatly appreciated. I have ordered mine and will report on how it functions within the MG. Thanks, and happy motoring!


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Smiths Temperature Gauge and Rover EFI
Posted by: BlownMGB-V8
Date: September 19, 2015 10:53AM

I always had the best luck using the matching sender originally designed for the gage and adapting the threads to the intake. There are thread adapters out there that go from British Standard pipe thread to NPT, and in some cases the threads are close enough you can get by with a good anaerobic sealant. Of course on my car I use the old dual gage which is mechanical.

Jim


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