[markandson]

Originally Posted by tomking If you arent going to keep the gauge installed permanently then just use a voltmeter instead to tune. IOW dont install an AFR gauge, just use your regular voltmeter set to the millivolt scale, tune and dissconnect. All the AFR is anyway is a limited range millivolt meter.

Tom you are correct, in the case of the Innovate LC-1 controller and the Bosch O2 sensor that diyautotune supplies the range is from 0-5V so a voltmeter could be used in place of the AFR gauge. Personally I figure if you have spent the money on the Controller and the sensor you might as well complete the setup and buy the gauge, it is the least expensive part and then you don't have to do the conversion or somehow recalibrate your gauge. BTW if you are doing this for a carb setup I would not use a digital gauge as it will be flying all over the place and it will be difficult to get a reading unless the software can buffer the changes and give you a good averaging effect. In my car the gauge swings almost the entire scale when I floor it since the acceleration enrichment comes into play and then if you back off immediately it goes to full lean so the needle is getting a real workout. Maybe after I get all tuned I can make it fly around the gauge face twice and then fly off .