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   Tach reads much higher by probably a 1000 RPMs

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Tach reads much higher by probably a 1000 RPMs by 72and86
Started on: 10-24-2020 11:50 AM
Replies: 6 (367 views)
Last post by: 72and86 on 10-25-2020 10:05 AM
72and86
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Report this Post10-24-2020 11:50 AM Click Here to See the Profile for 72and86Send a Private Message to 72and86Edit/Delete MessageReply w/QuoteDirect Link to This Post
Bought a project '86 SE V6. The Tach reads much higher by probably a 1000 RPMs then actual RPM. I've read a lot about this online but can't seem to get a straight answer. What's the definitive fix for this?
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Gall757
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Report this Post10-24-2020 12:46 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The 'fix' is to send a PM to J Gunsett.

//www.fiero.nl/forum/Forum2/HTML/140338.html
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pmbrunelle
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Report this Post10-24-2020 02:16 PM Click Here to See the Profile for pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
The fix isn't a J Gunsett exclusive; the RC circuit is fairly well documented.

http://www.nathanbittinger....ction/fieros_de_tach
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Gall757
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Report this Post10-24-2020 06:28 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
If the OP would like someone to fix his tachometer, I recommend J Gunsett.
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wftb
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Report this Post10-24-2020 06:55 PM Click Here to See the Profile for wftbSend a Private Message to wftbEdit/Delete MessageReply w/QuoteDirect Link to This Post
This is only sort of related but the last time I had my guage cluster apart (2004 Cavalier cluster) I managed to knock the tach needle up to 4K rpm .

Recalibrated by just twisting it back to 0. For all I know it might have just recalibrated itself by just turning the car back on but I did not try that.

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Dennis LaGrua
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Report this Post10-25-2020 07:54 AM Click Here to See the Profile for Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
I would also check the tach filter. Its basically a capacitor. They can dry out and change values.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
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72and86
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Report this Post10-25-2020 10:05 AM Click Here to See the Profile for 72and86Send a Private Message to 72and86Edit/Delete MessageReply w/QuoteDirect Link to This Post
Will this fix it?
https://www.ebay.com/itm/19...L90Z278x5ickk7d4nrem BkvNKtcC0ZwqXDIuFCu5lU%252BLGneSheO3g6w60%252FRvpxvG1GKKBceiBo2eAnKxadQkSfiQ6L%252BkH5%252FbYhz8W6tPeee9oVPPmrLf4DQlu2cXo7R%252BCg7Qc1hv%252BRqLBfUt77GJ8rkSLavY2KbSpTb6141sS94gn5I5xK6hxVJZ%252FyybuRgr4qMiUrsqNIQZV8kKcNiP6HXZTqdNbKeUVU4%252FwqcyeDqjnZAK2BvY veBPscQ1SLKBa%252BBhi7BHO%252FDCBi2%252BxtOavePoE72Mc3CfpfZ%252FXR8Q7VyGbSSwDqcmVSwDwMrSQOHxDNGrTN%252BD0Rqeg%252F2epc3ZEPO7IODwJ%252BiahWRkhrqx6Mgom2%252FD54zleB3D4SJED0X3TJI3MtoLZXuTp%252Bpjriko9Ogw%252BkDe2Y4SRAfgZeAi86208CJ8xTgkFoMyULEWaRhfBC1RYvy2PcrA RG2GFjf9vKQEpYG3bQTNG5ztGe2BWNoYuDxPPwcVoRY833%252BYWKMUEViRJuu2%252Bnsb1C1u9oibUkjsTNrk1MP0HbHR%252FDuYqdHYt6IGerD0jAv3RXBMUpyrQJNslxzawY0rgvq28dUK2s5wqsSkkVnBfc7UC7E3T2RmRJjdYe2YH%252FXPKHUtvCsdBlD4EgE%252FGrZegp0gNX%252BDCv%252F0rU4hT6zdYGs27Fkylbbj6vAq 8xHyT7BuWFgWuyBeraWu02w80GMorgpEmRxzNK3Dw3qFZZSBgRfBYgHf9J6RnsLS4kiX%252BzNd5zb8nVQNzzLP73jPAdJp5%7Ccksum%3A143366400388381c8d17b9f340a6a87ff9e31946fa95%7Campid%3APL_CLK%7Cclp%3A2334524
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