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Oil pressure gauge redux

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nick Avatar
nick nick m
Bend, OR, USA   USA
In an earlier post I had described my oil pres gauge installation, an electric XJ6 unit with a compatible sending unit, teed in with the TR7 OEM sender. However, the gauge reads 20 PSI, with no variation with temp or RPM.
I think my problem may be the power source I am using. I wanted to tap into a convenient place that was not hot with the key off. So I used the water temp gauge thinking it would suit my requirement. Can anyone see a problem here?



nick

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Darth V8R Avatar
Darth V8R Vance Navarrette
Beaverton, Oregon, USA   USA
1980 Triumph TR8 "Wedgie"
In reply to # 1492817 by nick In an earlier post I had described my oil pres gauge installation, an electric XJ6 unit with a compatible sending unit, teed in with the TR7 OEM sender. However, the gauge reads 20 PSI, with no variation with temp or RPM.
I think my problem may be the power source I am using. I wanted to tap into a convenient place that was not hot with the key off. So I used the water temp gauge thinking it would suit my requirement. Can anyone see a problem here?

The water temp gauge does not get a full 12 volts, the voltage to it varies with the water temperature.

I do not have a schematic in front of me, but I would say that you need to tap into one of the warning lights, one that illuminates when the key is in the run position, but the engine is not running.

By law, the lamps must illuminate when the key is in the run position, but extinguish when the engine is running. That is to allow the driver to observe that all the telltales are working properly, then when the engine is running they go dark unless there is a problem. The low oil pressure warning or low fuel lamp come to mind.

Vance



1980 Platinum Metallic TR8, navy blue interior
Bare metal respray, Crower cam, raised compression
ported heads, modified Zenith carbs, 0.060" overbore

nick Avatar
nick nick m
Bend, OR, USA   USA
I kind of thought that was the problem. I think I just might tap into the ignition switch wiring on the steering column. The instrument module harnesses are a bit too complex.



nick

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