Mgb Tach Wiring Diagram

Am hopeless with wiring diagrams. Mgb smiths tachometer wiring schematic and parts diagram. For the later 75 76 and onwards mgb came from the factory with a ballasted wire in the loom.

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62 64 mgb from bentley a8753aw 64 67 mgb from bentley b51798 67 68 mgb from bentley e1898w 68 69 mgb from bentley e2333w 68 70 mgb from bentley e2764w.

Mgb tach wiring diagram. For negative earth conversions the wire must be routed in the other direction undoing the knurled nut should allow the pickup to be dismantled and the wire reversed otherwise. Tachometer oil pressure water temperature diagram 4 68 69 mgb from bentley e2333w fuse box b bg gb rear window defroster switch gt only radio wg cigar lighter b ny. Check it 3 times from different directions before turning the key on. Read and follow the wiring diagram.

2012 04 13 22 14 35 5617. This is the time frame when the first 5 main engine the gb engine was used. The plastic block is just a former for a single turn of wire shouldn t be difficult to make one from wood at the very least. Changing to electric tachometer dt 201.

These pdf files can print full size on 11 x 17 paper. A tachometer counts the number of rotations the crankshaft is making a minute rpm. Wiring diagrams for mgb mgc. If the rpm of an engine is allowed to go outside of specific limitations moving parts begin to generate enough heat and friction to become damaged.

Member comments on smiths tachometer servicing. Mg mgb technical 65 67 tach wiring bbs discussion. If you install a 1965 or newer mgb engine in your mga keep in mind that the five main bearing engines have no mechanical tach drive. The most common solution to this is to install an electric tachometer from the 1965 1967 mgb.

What parts are you implying when you state a 3 ohm internally ballasted coil. I also checked the wiring diagrams for this car and found the current goes from the ign switch through the tach to the. Tachometers showing the external pickup on the 64 to 67 rvi tach and the routing of the wire from the coil sw towards the ignition switch a3 for positive earth cars. Member comments on pertronix installation secrets.

The limited data i have available tells me the tachometer in this year mgb is triggered by a current pulse from the ignition system. It can also be used to shift gears at the right time during acceleration and braking. Coil is fed via the current sensing pertronix ignitor ii with factory tachtach pertronix. The problem is the tach is now unstable and reads about 1700 rpm high and erratic.

Page topic list forum list newer older start new have never changed anything with the tach wiring and tach has continued to work. Al connection look ok clean added earth wire to stub on back no result. Comment by robbie p. Mgb the trick is to take the feed to the pertronix not from the coil as probably described in the connection diagram.

Click links for 33 different wiring diagrams for mgb and mgc large format in color.