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Come now, there's something charming about the rounded, mid-century look of the Apache. It's really a snapshot of the styling of the time.

So, back on topic, I ended up selecting a new stock unit to go back in. As much as I hated to do it, it was the best choice. The failure mode was such that it could not be economically repaired and would have taken far too long...I called around no one had exchange units available. The digital...

Just to finish this one out...prop was overhauled by American Propeller and now it's pretty again. Including R&R, shipping, inspection, overhaul, and everything, it was just under $2000.

Clearly so, as it's what provides the clock for every steam gauge, IFR-ready 172S. But...why? The logic doesn't make sense...why is it OK for Davtron but not OK for other avionics?

Interesting. That's what I get for running from memory instead of actually reading the regs. Also, nicely done remembering the Davtron model that is in my plane. I hadn't mentioned it in the thread, but you have it right. So the question remains, as per @Ryan F. , does it count as permanent if...

Oh, last item...anyone have experience with getting a ferry permit with an inop tach? Looks like if I'm doing anything other than a straight replacement, I'll likely need to go elsewhere. Would the FAA require something like a laser tach aimed at the back of the prop?

Oooh, I want that so much. I cannot justify it in the least for 172, but yeah... As for the clock, that's a nice choice. Didn't realize that one existed. If I didn't already have 5 USB charging ports in the panel, it'd be even more tempting. Still, at $700 for a clock, I'd probably just leave...

IFR countdown clock to keep the plane IFR legal. Though it's possible that it exists and I missed it.

Are you sure the panel needs to be cut for the EDM? I know it can be flush mounted, but it's round behind the panel and I believe it can be surface mounted. My G5s are the same...surface mounted. Thanks for the info. My thinking is similar to yours, but...$10K or that region is a lot of money...

Yeah, I figured $10K+. I've had basically the same advice that an EIS on a 4-cyl fixed pitch makes little sense. But...I've also had several engine issues that could have been caught earlier, possibly, by data logging. Since last overhaul, three cylinders have been replaced (one twice). Fuel...

Yeah, not sure why a repair option wasn't presented to me by the A&P. I shall ask. If that's really just $200, that's a clear winner.

Yeah, those were the models I was most interested in prior to the announcement of GI 275 EIS, mostly the CGR-30P. The CGR-30P is a little cheaper, by about $1000, but the instrument selection is more limited. Spec'ing it out results in fewer other gauges leaving the panel. It's the same form...

Sorry, that came out rougher than I intended. It looks fine to me, and seems to work well. I'm just channeling my inner renter. Experience has taught me that different without really obvious benefit (like my G5s) gets a plane less interest and fewer renters. Either way, I appreciate you bringing...

Yeah, maybe. Probably still wouldn't help me...it's a leaseback, so spending the extra $500 on the Superior one makes sense to get it back on line now instead of a month from now when the paperwork comes through.

The question would be: lifetime to what? What happens as subscription levels move around? Products change names? There's almost always a legal out for "lifetime" anything.

Arrgh. I just looked and the 172S is not on EI's STC and AML. Does that pull this off the possible choices? The damn AML hasn't been updated since 1997!

Good to know. Can it do 28V?

Interesting option. Hadn't seen that one before. I see many on eBay for around $250. Thank you. I'll keep it in mind, but there's a complication on my plane: it's a leaseback. The small price difference to the new EI unit will result in more than that amount of spurious squawks for the weird...

My A&P just declared my tach junk. I've got a steam gauge 172S. Looks like the a direct replacement SLI model is about $800 plus another $120 or so if I want to set the tach number to match the old one. I've been toying with the idea of putting in an EIS of some sort for a while. The GI 275...

Do update your software. There have been significant changes in battery handling, as there have been issues with the G5 not turning off, emptying the battery and damaging it. Odds are you have a bad battery, but the software updates can prevent it from happening again. You can do the updates...