Dorset7 Posted July 10, 2015 Share Posted July 10, 2015 I'm a fan of the mechanical OPG and had them fitted on both my K-Series cars. Has anyone fitted one to a Sigma engine (can you?) and if so does anyone have a list of parts? Cheers Link to comment Share on other sites More sharing options...
mikecocker Posted July 10, 2015 Share Posted July 10, 2015 You'll need a gauge (I use Racetech combined pressure/temperature), oil pressure line 6' with 1/8" bsp flat ends and a 1/4" npt male to 1/8" bsp male adaptor to replace existing sender unit on engine block. Demon Tweeks tele sales are very helpful.If you want temperature as well, the capilliary line is fitted to the gauge but you'll need to weld a 3/8"bsp boss (Merlin Motorsport) to side of sump to accept the sender. Link to comment Share on other sites More sharing options...
Dorset7 Posted July 10, 2015 Author Share Posted July 10, 2015 Thank you very much indeed! Link to comment Share on other sites More sharing options...
Garth Posted July 11, 2015 Share Posted July 11, 2015 I have mechanical oil pressure and mechanical oil and water temp on my Sigma (also fitted a low oil pressure warning light!) - all work a treat (although the warning light has never come on so not sure if that is working!?) - also used Racetech. Away for a week, but let me know if can be of help on my return. Link to comment Share on other sites More sharing options...
Dorset7 Posted July 12, 2015 Author Share Posted July 12, 2015 Cheers Garth. Link to comment Share on other sites More sharing options...
JwBye20 Posted May 29, 2017 Share Posted May 29, 2017 I'm looking at fitting a mechanical one to my sigma engine, could someone show me the location of the sender which has to be removed and the best way of carrying out the swap? Is there a guide stashed away anywhere? Cheers, jack Link to comment Share on other sites More sharing options...
Garth Posted June 2, 2017 Share Posted June 2, 2017 Hi Jackdid mine a few years back - could send you some pics if that would help? Send me your email address if you would like them.Garth Link to comment Share on other sites More sharing options...
DRH Posted June 7, 2017 Share Posted June 7, 2017 I had on good authority today: " mechanical oil pressure gauges were a good option on the K series engine's because the temperatures tended to fluctuate quite a bit, but on the sigma this was not a problem so not really necessary" In addition, negating the issue of having oil in the cockpit seems a big plus. Although I must say the double gauge showing pressure and temperature with the addition of a warning light look pretty cool. Link to comment Share on other sites More sharing options...
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