Smiths Temperature Gauge and Rover EFI

[Johnous]

I am running a 1978 MGB with a Meqasquirt-n-spark 3.5L. This is building off of Curtis' excellent piece  here: http://forum.britishv8.org/read.php?6,36253

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 http://www.mgexp.com/phorum/read.php?1,996377):
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]

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