Thought I'd bump this with a little rant. I noticed my gauge was not matching the output in megatune. I took some pictures of the gauge and the MS to see what the discrepancies looked like. In the 14 pictures I took the gauges matched in 1 picture. In 4 pictures the gauge was reading higher than megatune. In the other 9 pictures megatune was reading higher than the gauge. There doesn't seem to be any kinda of correlation to one being higher than the other. Awesome.

A couple 12.4 afr shots...

Attachment 204393

Attachment 204394

The pictures:
gauge........megatune...difference
11.5..........11.8..........-0.3
11.7..........11.4..........0.3
12.1..........11.7.......... 0.4
12.2..........12.0.......... 0.2
12.4..........11.5.......... 0.9
12.4..........13.6.......... -1.2
12.7..........12.3.......... 0.4
13.2..........12.5.......... 0.7
13.6..........13.5..........0.1
13.7..........13.4.......... 0.3
14.0..........14.0..........0
14.6..........15.2..........-0.6
15.4..........15.7..........-0.3
15.6..........15.5.......... 0.1

The gauge worked perfectly until the last month or so. I'm going to check over all my connections, but the wiring was actually done by Joe so I don't see how that could possibly be the issue. :wavey:

Thats the way the AEM works with the MS unfortunately. The reason why im switching out my AEM for an LC-1 when the MSII protoboard gets up and going.

Damn and I was just thinking about ditching the LC1 and getting an AEM... Was taking a 10-100 the other night with a jegs catalog and found for 20$ more than what I paid for the LC1 I could get a fucking gauge too..

AEM 6-in-1 Gauge-Type Wideband UEGO Controller - JEGS

So the UEGO sucks even more dog shit with megasquirt than an LC1? :(

My gauge was fine until recently. Ebay is the cheapest place I've seen UEGO's, just under $200 shipped for a new one.

pdexta, the MS and AEM are grounding to the same spot? I've installed two AEM and after fooling with the formula and converting to A/F I never had an issue with them reading "close enough"