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tacho perspex

Woodstock

Well travelled
Location
Woodstock, NY
I want to replace the tacho perspex which has a flaw that may lead to other problems with moisture. Any thoughts on the perspex itself, where to buy or have a new one made, and/or disassembling the tacho to remove the old perspex? Thanks
 

JessHerbst

Finally made it
Location
Texas, USA
Sorry, but what is a ’perspex’?
i have disassembled the gauges on the 750 to replace the faces, attached is a photo of alll the parts.7962C0FC-9AEB-4556-B5F5-C666B0D55E62.jpeg
 

Woodstock

Well travelled
Location
Woodstock, NY
The clear plastic cover. You have responded previously. I am investigating a solution given your prior information that the plastic cover is bonded to the housing. Thanks.
 

Matty

Getting there...
Location
NE England
Not sure whether this will help your issue... but on another thread, Haggisman told me to remove the yellow stickers on the back of the instruments to cure the condensation issue. Went for a ride in the rain yesterday and both gauges were crystal clear.
 

Woodstock

Well travelled
Location
Woodstock, NY
Sorry, but what is a ’perspex’?
i have disassembled the gauges on the 750 to replace the faces, attached is a photo of alll the parts.View attachment 6643
Jess, to again pick from your experience, should I be able to take off the back of the instrument cluster without destroying the water proofing around that connecting cable. That is, unscrew the screws on the back and then pry off the connection to the inner workings but without pulling the rubber back so the cable stays on the piece? Thanks for your help. I am trying to be minimally invasive in whatever I do. I don't want to buy a whole new instrument cluster and have a zero odomoter. I just want to replace the housing with the glass/perspex as it comes from the manufacturer sitting in the housing.
 

JessHerbst

Finally made it
Location
Texas, USA
Jess, to again pick from your experience, should I be able to take off the back of the instrument cluster without destroying the water proofing around that connecting cable. That is, unscrew the screws on the back and then pry off the connection to the inner workings but without pulling the rubber back so the cable stays on the piece? Thanks for your help. I am trying to be minimally invasive in whatever I do. I don't want to buy a whole new instrument cluster and have a zero odomoter. I just want to replace the housing with the glass/perspex as it comes from the manufacturer sitting in the housing.
you need to remove the back screws and pry back off enough to get fingers inside to release the connector tab.
 

Woodstock

Well travelled
Location
Woodstock, NY
That's it. Tnx
you need to remove the back screws and pry back off enough to get fingers inside to release the connector tab.
Hey Jess, just to touch base. Everything worked out and much thanks for your advice. I bought a new supposedly RE original instrument cluster, with only kilometers on the face, on Ebay and changed the outer housing on my internal electronics and the base/back of my unit. It was the same manufacturer though the part number was slightly different. I removed the rubber housing from the plug and then disconnected the plug at the cluster to remove and change out the outer housing on the work bench. That negated removing and unplugging from inside the headlight. The new outer housing was slightly different as it fitted to the base but it seems more water tight as it slots completely over the old base. Everything has fired up. The only real hassle is sealing the rubber boot back on over the plug. I did not use compound as the existing compound was only in the corners and seemed more glue than to keep out moisture. The rubber is a deep and tight fit into the unit however, so I don't see how it is possible for it to shake out. But I will watch as how did the tacho perspex crack to begin with? Thanks again. Was a complete morning job at my speed but time well spent. I tired of having Tupperware lids to keep the rain out of the electronics. Hope this helps someone else but I also believe I was very unlucky for a crack to appear at all.
 

Matty

Getting there...
Location
NE England
I want to replace the tacho perspex which has a flaw that may lead to other problems with moisture. Any thoughts on the perspex itself, where to buy or have a new one made, and/or disassembling the tacho to remove the old perspex? Thanks
I had moisture inside both my dials and someone on this forum said it was condensation and would be cured if I scraped off the two yellow sticks on the back of the guages. Not sure if that's the issue here, but I can report that it worked perfectly
 

Woodstock

Well travelled
Location
Woodstock, NY
I had moisture inside both my dials and someone on this forum said it was condensation and would be cured if I scraped off the two yellow sticks on the back of the guages. Not sure if that's the issue here, but I can report that it worked perfectly
My issue was a cracked face allowing water into the housing, now resolved as above, and consequently I had an evaporative moisture issue in one clock but your suggestion is noted if I have further issues. The moisture in the clocks seems to be a known issue. I was unlucky with the cracked perspex though there are two other riders I know from the Internet who had a similar issue. I could have replaced the clocks in entirety and started again at zero miles but chose not to. Thanks for reaching out.
 
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