Why replace Speedo and Tach Cables ?
Hmmm ...,I have an R90 where every now and then on a cool day the tach jumps up by 3k or so . If I tap tach it drops back to where it should be .
On Brit cars I've seen dry speedo cables stick , then wind up , then release which bounces the needle up ... but that doesn't seem to be the case here . ( a graphite cable lube fixes this )
More closely I've seen Brit cars where too much cable lube will enter the speedo thru the cable connection and internal to the speedo stick the spinning metal housing to the needle assembly which causes it to read too high .
( a squirt of carb cleaner fixes this )
Reason I mention brit stuff as they are the only ones I'd seen with similar problems , where I've opened up the speedo and / or fixed it .
Should I replace my R90's cables ? I'm happy to do so ... But if so why ?
Not pushing back , just looking for what / how that fixes things vs fixes listed above.