Path: utzoo!utgpu!alliant.com!UUCP Reply-To: british-cars@alliant.com Errors-To: british-cars-request@alliant.com Sender: british-cars-request@alliant.com Return-Path: Message-ID: Date: Wed, 21 Feb 90 21:20:00 EST From: craig@tolsoft.tolerant.com (Craig Harmer) To: jesup@cbmvax.commodore.com Subject: Re: Speedo on TR6 (and E-Type) Cc: british-cars@alliant.com Newsgroups: list.british-cars Distribution: ut Approved: devnull@gpu.utcs.toronto.edu Date: Mon, 19 Feb 90 11:58:26 EST From: tolsoft!amdahl!ames!garp.MIT.EDU!mit-eddie!cbmvax.commodore.com!jesup (Randell Jesup) Message-Id: <9002191658.AA06503@cbmvax.cbm.commodore.com> To: british-cars@Alliant.COM Subject: Re: Speedo on TR6 (and E-Type) Status: O >well, on my friends bugeye'd sprite, the tachometer was electrical, and >measured the RPM by means of an inductive pickup off the wire bringing >12 volts (originally ground) to the coil. when the points closed, and >the coil charged, a current would flow in the wire which would induce a >voltage inside the tach. Uh, I think you're confused. The Bugeye's (and the Mk II's) had mechanical tachs run off the generator (via a hard-to-find little gearbox). Starting with the Mk III (1098cc, roll-up windows, etc) they switched to the inductive tachs, which were used for the rest of the sprites and midgets. Also interesting was that the inductive tachs would vary their readings slightly depending on whether the lights were on (voltage drop). oh! his car was definitely a bugeye, so i guess someone had retrofitted an inductive tach into it. i guess i was confused as to how the tach switch was done, though ... craig