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Gauges

Gacataki

CB750 Enthusiast
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Hi all. Hope this isn't a really dumb question, but please help. I woul like to retrofit (not permanently), a temp, amps and oil pressure gauge to my CB 750 Custom. The amps would be pretty straight forward, but any idea where I'd get a feed for temp and oil pressure?
 
You'd definitely have to add a temperature sensor and an oil pressure sensor to provide output for those gauges, as the engine doesn't have either in stock form. There's no temperature sensing ability at all in the bike as it was built and the oil pressure "sensing" for the warning light is a simple switch that opens or closes at a specific amount of pressure.

A temperature sensor is relatively easy to add, as you simply need to find a good location to stick a temperature probe on the outside of the engine. Perhaps on top of the valve cover or inside the valley for the spark plug holes.

The oil pressure sensor is a little more tricky. If you're retrofitting a fully digital gauge cluster that has a programmable oil warning light, you could perhaps replace the original oil pressure light switch with a sensor that had the same threads, and program the light to only come on below the typical oil pressure at idle. That's probably the easiest way to do it.
 
Just got this bike, so I haven't looked real close, but there's a manual oil pressure gauge and the light still works, so I assume this was tee'd off of where the switch mounts.
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Air cooled engine temperature sensor where to put it?? Exhaust gas temperature EGT is the best way to judge engine temp.

I use a infrared temp to confirm all 4 headers are the same temp Bike idling after a ride.

To have a gauge on the instrument cluster is an interesting concept
 
Air cooled engine temp is normally taken at the top of the cylinders in the fins or on the cylinder head in the fins as that is where the combustion process is and where the most heat in the engine are. Air cooled aircraft engines typically get temperature in the cylinder head area. EGT tells you combustion chamber temp and general operating condition but can be vastly different then engine temp. EGT will be higher than engine temp and can vary quickly as compared to the engine temp which is more of an average as the engine acts a kind of heat sink and averages out the overall temperature. EGT can spike with preignition or lean conditions or hard pulls.....even if the engine is stone cold. Engine temp can be 60 degress or 250 degrees and EGT still be 150 or 300 no matter what engine temp is. So EGT is definetly very useful especially in diesels but not really a judge of engine temp but is the best way to judge what is going on in the combustion chamber with fuel ratio and spark.
 
Thanks. Yes definitely would like to 'customize' my cluster to include oil, temp and amps. Somehow with keeping the bike original. Probably would make it easily reversible. Any suggestions?
 
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