Need advice/recommendation CHT/AFM Gauges Options

[hermich]

I am in the process of building a second 914/4 and need advice on what folks are using for cylinder head temp and wide band air/fuel gauges? I am currently using a VDO CHT gauge and an AEM air/fuel gauge on my current car. While looking for gauges for the new build, it appears that the VDO gauge is no longer available and I'm just not sure about the AEM. Any thoughts, suggestions or recommendations of reliable gauges would be greatly appreciated. Thanks in advance.

Herman

[Montreal914]

I've been using these since I've rebuilt my engine to a 2056 about 5 years ago:

Head temp gauge:

http://thesensorconnection.com/cht-sensors...e-sensor-kit-fs



A head temp gauge is nothing more than a type K thermocouple reader. In the image below taken here (https://en.wikipedia.org/wiki/Thermocouple), we can see Tref which happens at the transition between the TC chromel/alumel wires and the copper wire.



The TC will read the temperature differential between Tref and Tsens. This is why you don't want Tref to be located in the engine compartment (Like the VDO gauge). This would not give you the proper head temp as it would be offset by the engine compartment temp. Ideally, you want the TC wire (chomel/alumel) to run all the way to the gauge, and have a compensated gauge that will have a sensor measuring the temperature at the gauge connection point (which will be cabin temp) and compensate (compared to 20-25C room temp) in order to give you the correct head temperature.

Google is your friend... (IMG:style_emoticons/default/cheer.gif)


AFM gauge:

http://aemelectronics.com/products/gauges/...-uego-afr-gauge