aftermarket ECU, coil-on-plug setup, swap tach assy or SS III cluster? Options

[match220]

Ok..look through this thread if you want to see my past attempts.

http://www.6gc.net/forums/index.php?showto...chometer+signal

In short, my temp gauge and tach gauge don't work anymore. The options I've thought about are (1) getting SS III gauges off ebay for $150 and swapping the odo, or (2) getting a cluster from an early 00's toyota car that has coil-on-plug setup from the factory and putting that tach in with my gauge face (may not be accurate).

Option 1 seems more doable, but I don't want to spend the $150 on gauges (PLUS I don't know if my wire harness connects to the SS III gauges, can someone tell me???) If so, all I would need to do is connect the tach wire from my Autronic ecu and configure, correct? Hopefully the wire connectors aren't needed.
Option 2 seems cheaper if I can find working used gauges on ebay. I'm concerned about the tach signal not lining up with the correct numbers (since I would have the moving parts from the donor car and the gauge face from mine). The only other downside would be that I still have to fix my temp gauge.

My only questions are about the interchangeability of the SS III gauges with the celica (manual trans GT convertible). And if anyone knows what other toyota models with coil-on-plugs would be good candidates for using the RPM gauge in the celica.

[match220]

HEY!!
So I found this ebay seller selling SS-III automatic gauges, and for a lot cheaper. Is there a BEAMS engine that is paired with an Automatic transmission? If not is the engine in the Auto SS-III at least configured with COPs so the tach would be a signal from the ecu? The only difference on the back of the gauges seems to be the extra square plug. I'm going to compare the circuitry to my gauges circuitry to make sure it's the same. Either way I'll probably buy them, at the very least I could rob the tacho(considering the signal is the same), BUT what I'm thinking of is using the Auto trans lights for indicator lights to show certain systems running like fans, wideband controller, and maybe a shift light, or whatever else I'll think of using the extra bulbs for. A friend of mine has a business with a vinyl printer, I can scrape off the P R N D 1 L letters inside of their respective boxes on the display and put other letters in there with a vinyl sticker that has a clear letter cut out.

SS-III automatic gauges pictures