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Thread: Gauges on opti
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09-11-2019, 03:09 PM #1
Gauges on opti
Can gauges that worked on a 1993 2.5 EFI , work on a 2018 3.2 Optimax? Water pressure, temp ,tach. Gauges are newer auto meter
1986 cougar mtr 21
2003 supra launch ssv
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09-11-2019, 09:40 PM #26000 RPM
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Yes and no.
Need analog senders and the harness
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09-13-2019, 05:20 PM #3
I'm switching everything over to digital and rewiring the whole boat so have some sense of how it works and what the differences are. Mine had the 15 pin round to 8 pin round adapter (84-896542A01) and the old style 8 pin boat harness. The tach works fine didn't have water temp but I don't think that goes through the harness and the pressure gauges are mechanical so also work fine (should be a plugged tee near the rigging tube.
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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09-13-2019, 05:53 PM #4
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09-18-2019, 05:35 PM #57000 RPM
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dont go with a digital trim guage. they are slow to read the actual trim.
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09-18-2019, 05:53 PM #6
I'm kinda committed to digital trim at this point. What are you basing that on? Display on an SC1000? I am going with the Livorsi LED indicators. I hope it's not a problem because that little box is stupid expensive!
Thanks for the heads up and I will report back when I get it up and running.
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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11-01-2019, 07:58 PM #7
I didn't have any trouble with the digital indicators on trim. They seem very responsive and the ability to calibrate the full down, full up and a sweet spot marker is a bonus. I set the full up to be about beaching height as I don't need an indicator any higher than that. Now I have to make senders for the jack plates to get those indicators working.
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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11-02-2019, 11:34 AM #85000 RPM
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11-02-2019, 01:40 PM #9
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11-04-2019, 12:38 PM #105000 RPM
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11-04-2019, 03:33 PM #11
I'm surprised it's not available because there is no simple way to get the digital output to work on an analog gauge. I thought I saw a thread on changing the digital to analog sender but can't find it now so you are probably right. You might have to use something like this 8M0099687 analog gauge interface.
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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11-04-2019, 04:45 PM #125000 RPM
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Whats odd is the Water temp, Tach and volt work. Are they digital? This rig is new to me and I have not torn into it yet.
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11-04-2019, 05:35 PM #13
You probably have the 14 pin to 8 pin adapter under the cowling. That allows you to use the older style 8 pin harness which takes care of the tach and volts is volts so it works anyway. Not sure about the temp but there is a 4 wire temp sender that has both the digital and also the brown lead for analog. Here is a link to a manual (90-898305) that has a bunch of info. Check page 31 for the trim sender note that made me think you just had to change the sender. Page 32 talks about the temp. It says 135 through 250 so may not apply to the 300's but worth checking.
https://www.google.com/search?client=firefox-b-1-e&biw=1366&bih=614&sxsrf=ACYBGNQIn0dV2KaGUSRsby6k_4Vv-EuGzg%3A1572905648070&ei=r6LAXbjKOcLE0PEPsr64-AY&q=analog+tmp+optimax&oq=analog+tmp+optimax&gs_l=psy-ab.3..33i160.17547.39032..39536...0.0..0.143.2282.0j18......0....1..gws-wiz.......35i39j0j0i67j0i131j0i20i263j0i22i10i30j0i22i30j0i13j0i13i30j0i8i13i30.aHqspCoMgAg&ved=0ahU KEwj43aSTytHlAhVCIjQIHTIfDm84ChDh1QMICg&uact=5
Select the PDF or search for 90-898305
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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11-05-2019, 11:21 AM #145000 RPM
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